`Islam vs. Christianity`

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I can't help but feel sorry for 1.2+ billion Muslims in the world every time I hear a Muslim say something like, "Christians deviated from the true gospel and so God/Allah sent Muhammad to guide them." I'm like when exactly did Christians deviate from the true gospel? What was the true gospel? Islam denies the core teachings of mere Christianity which can be found all over the NT documents which is known as the Gospel and is simply undeniable. These core teachings include the death and resurrection of Jesus of course.

The maniscripts of the NT go all the way back to the first century. That is more than 500 years before Muhammad was even born. So when exactly did Christians deviate from the true gospel and what was the true gospel? These are important questions that Muslims can't answer without appealing to the Quran which came 500+ years after Jesus and early Christians who believed that Jesus was the divine Son of God who died on the Cross for our sins and rose from the dead, according to the scriptures. "Dear friends, do not believe every spirit, but test the spirits to see whether they are from God, because many false prophets have gone out into the world.” —1 John 4:1

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Not only that, but there are thousands of denominations and sects of Christianity all around the world and the evidence is not just limited to the manuscripts that they all share, but also comes down to their traditions and history, some of which go all the way back to the first century again such as the Orthodox churches in Egypt and Rome. Are we supposed to believe that there was a global conspiracy at the first century where every single Christian in the world decided to conspire against the true gospel? Would that even be possible in the first century? Are we supposed to believe that God couldn't even find one faithful group of people to preserve the true gospel? And when Rome accepted the false gospel and established the Catholic Church in the 3rd century, God/Allah didn't do anything for another 300 years until the false gospel spreaded even further? It seems to me that Muslims don't seem to understand that their view of God turns Him into a completel loser.

Even the Quran seems to have no clue how problematic these charges are and as a result tends to contradict itself on so many levels that it becomes really ridiculous when one examines it. As we see in the following video, Quran affirms the inspiration, preservation, and authority of the Christian scriptures (including the Torah and the Gospel). Yet the Quran contradicts the Christian scriptures on fundamental doctrines(e.g., Jesus' death, resurrection, and deity). By affirming scriptures that contradict Islam, Quran self-destructs.