Popularity does not concern me. Truth does. In a time when people are being told lies about a religio-political system which permits altering facts to cover its tracks, it is needful for me to write this as a warning. I do not write it with any animosity or hate toward anyone. Christianity is the antithesis of hate; it does not permit it to be practiced by believers. Therefore, anyone who suggests that this article is ‘hate speech’ is merely muddying the water to distract from its purpose and point: to alert everyone, especially Christians, to what is looming over the horizon in the form of Islam and its insistence upon a world governed by Sharia Law.
“Know thy enemy” (Sun Tzu) is a sound tenet of military doctrine. It is most applicable here. Unless we know the differences in our religions we will be ill suited to tackle the task of debate, lacking the ability to be conversant when we attempt to bring Muslims to Christ or protect ourselves when and if Sharia Law becomes commonplace. I therefore offer the following reasons why Islam is the enemy of Christianity:
1. Islam’s master teacher, Mohammed, in the Qu’ran, affirms it:
“Regarding Christianity, however, the approach seems to remain static and constant. For instance, 5:14: “And from those who call themselves Christians, We took their covenant, but they have abandoned a good part of the Message that was sent to them. So we planted amongst them enmity and hatred till the Day of Resurrection, and Allah will inform them of what they used to do.” Soon after, 5:51 has: “O you who believe! Take not the Jews and the Christians as friends, they are but friends to one another. And if any amongst you takes them as friends, then surely he is one of them. Verily, Allah guides not those people who are the wrongdoers.” And then 5:73: “Surely, disbelievers are those who said: ‘Allah is the third of the three (in a Trinity).’ But there is no god but Allah. And if they cease not from what they say, verily, a painful torment will befall the disbelievers among them.” Matters don’t improve for Christians, and as we move forward we read 8:39, which says: “And fight them until there is no more disbelief in Islam and the religion will all be for Allah Alone…” and then 9:23: “O you who believe! Take not for supporters your fathers and your brothers if they prefer disbelief to Belief. And whoever of you does so, then he is one of the wrong-doers.” 
If its own founder says so, then what I am saying should come as no surprise. As a side note, early passages (some peace oriented) in the Qu’ran are superseded by the older ones which, when Islam had grown powerful, are militaristic and warlike.
2. Islam teaches Jesus Christ is not deity (divine).
There is no Christianity (known in the New Testament) which excludes the confession that Jesus is the very Son of God. The substance of that confession is what Christ’s visible Body on earth, the church, is founded upon (i.e., His deity) (Matthew 16:18). To Muslims, Jesus is not divine but only another of God’s (Allah’s) teachers and a lesser of Mohammed. The Apostle John makes this a huge distinction between those who are “of God” and those who are not and are branded as “anti-Christ” (1 John 2:22; 4:3).
Jesus warned that others would come claiming to be the Messiah (i.e., God’s anointed one) and that their testimony would be so convincing as to nearly deceive the elect, yet they were not to be believed nor followed as they were deceivers (Matthew 24:24; Mark 13:22). Mohammed is surely among those of whom He spoke.
Jesus said, “…if you do not believe that I AM, you will die in your sins” (John 8:24). In using the description that God (Yahweh) designated for Himself (Exodus 3:14), which His detractors knew He was doing deliberately and wanted to kill Him for, Jesus makes it unmistakably clear: He is the equal of the Father, Yahweh, and to fail to believe that as truth invites eternal damnation. Islam not only does not recognize Jesus as divine, such an idea is, in their view, blasphemous.
3. Islam is “another gospel” and is therefore a false one.
The Apostle Paul stated in no uncertain terms: “If we or an angel from heaven preach any other gospel that that which we have delivered to you, let him be accursed” (Galatians 1:8, 9). To ensure clarity and for emphasis he repeated it. Islam is another gospel, another way of salvation. Just as one cannot have two masters, one cannot have two gospels, two different ways of salvation. One has to be wrong. and the other right. One either preaches the gospel of Jesus Christ or that of Mohammed. In doing so one is either correct or cursed.
4. Islam is a legalistic system of salvation, one of works of human merit, not of grace as is Christianity.
As with all other religions, major and minor, Islam is legalistic in nature. It is a system of justification by works defined by a religious code. These activities are of merit and count towards effecting in the performer a measured righteousness. Christianity is entirely different. Righteousness is by faith in Jesus Christ. Any “works” performed are those which are by faith (trusting obedience) and which believers are appointed unto (Ephesians 2:8ff). Salvation is by grace through faith in Christ Jesus, Him being the Son of God. One cannot mix meritorious works and grace (Romans 4:4, 5). Islam is entirely about a believer’s works of merit. Christianity is about the atoning work of Jesus Christ whose selfless offering of His own blood is the only justification for sin (Hebrews 1:1-3; 10:38). The two systems, therefore, are diametrically in opposition to one another and can never find common ground.
5. Islam forbids Christian evangelism.
Christianity is the preaching of good news concerning God, humanity, sin and salvation. Jesus Christ commissioned Christians to preach the gospel to all nations and then to baptize believers (Matthew 28:18-20; Mark 16:15, 16; Acts 1:8). Islam demands Christians disobey what their Lord has specifically commanded them to do. To that we must add our voice to that of the apostles “We must obey God rather than men” (Acts 5:29). Muslims who convert to Christianity are widely hounded and persecuted unto death. Christians in Muslim countries are persecuted also. If Christians do not preach Christ in some fashion, they fail in their mission and purpose. Islam seeks to assist them in that failure.
6. Islam authorizes murder and deceit.
History is replete with barbaric episodes wherein “Christians” (so-called) have murdered, looted, and behaved shamefully in the Name of Christ. There is no doubt about that. Christ’s words were, and are, either ignored or taken out of context by those with manical, racist, xenophobic, and homicidal agendas. One look at Jesus’ own words should convince anyone that Christianity is a non-violent religion in principle and practice (Matthew 5:43-45). The fact is, Jesus Christ never authorized His followers to use violence to achieve His aims. When He spoke of the use of swords, it was figurative (Matthew 10:34-39) or in fulfillment of a prophecy (Luke 22:35-38). He specifically forbade violence (Matthew 26:52) as did the Apostle Paul (Romans 12:17-21). Not so with the Qu’ran. It specifically commands its followers to enslave, kill or destroy all who will not submit to it. For Christianity it is universal love and peace between God and humanity, and humans to one another (Matthew 22:34-40; Luke 6:27-38). Islam’s Jihad (holy war) stands in stark contrast.
Islam also authorizes its adherents to lie when necessary. It is called Taqiyya. This is akin to the Roman Catholic doctrine of Mental Reservation . Taqiyya is:
“Falsehoods told to prevent the denigration of Islam, to protect oneself, or to promote the cause of Islam are sanctioned in the Qur’an and Sunna, including lying under oath in testimony before a court, deceiving by making distorted statements to the media such as the claim that Islam is a “religion of peace”. A Muslim is even permitted to deny or denounce his faith if, in so doing, he protects or furthers the interests of Islam, so long as he remains faithful to Islam in his heart.” 
According to the New Testament there is no occasion for lying or deceit of any kind be it Taqiyya or Mental Reservation. The Apostle John states: “…and all liars shall have their part in the lake of fire…” (Revelation 21:8) One cannot find a more explicit denial of any right to lie than that, even for one’s religion.
We would do well to remember this when listening to Muslim spokesmen or organizations when they defend Islam or seek to stifle protests of Islamic terrorism and bigotry. They may not all be lying, but this proves they well may be.
7. Islam has females subordinated as virtual slaves to males.
Everything about Islam insists upon male domination of females. Women are forced to wear special garments (Burqa) and participate in ritualistic mutilation  as deemed necessary. Males have complete control in all walks of life with legal power of life and death over all family members. In Christ, females have become liberated from ancient traditional roles in work and service (Galatians 3:26ff). Only in certain areas of public worship were females required to take lesser roles than males (1 Corinthians 14:34-37; 1 Timothy 2:12-14). It was Christianity which elevated females from a subordinated, inferior, position to men towards equality in religion which ultimately gave way (at least in some areas) to a measure of social equality and standing with males. Had it not been for the teachings of Jesus Christ there is a very real probability that females would have continued to be treated as little more than slaves even until today. Islam insists upon a male-dominated society with females as second-class citizens.
Other reasons could be cited, but these should suffice.
Do not foolishly and vainly imagine Islam can co-exist with Christianity. They are religious systems which are in direct opposition to one another. One must submit or convert to the other before there can be peace of any kind. For Christians to “submit” to Islam means they get to keep their heads but lose their money  and not seek to make converts. For Muslims, converting to Christianity means losing their lives, once for Christ’s sake (Matthew 10:39) and possibly their physical one for having betrayed Islam and Allah.
Islam is not and never has been the “religion of peace.” Christianity, practiced by those who live by its pure New Testament form as we all must do, has held that title for more than two thousand years. It has not been eradicated by famine, sword, nakedness, atheism, paganism, or perils of any kind throughout that time. Like all other enemies of Christianity, Islam will fail and fall, but Christian, prepare yourself.
“And I also say to you that you are Peter, and on this rock I will build my church, and the gates of Hades shall not prevail against it”
“The blood of martyrs is the seed of the church.”