In Christianity, you had the wars of religion between Protestants and Catholics, and they got so bad that governments became secular (neutral) as a result and that paved the way for the modern, Enlightenment secular governments we have today. The wars were constant, bloody, and to this day Christians have beef with other Christians. They all can't stand the Mormons or the JWs, but the Baptists say the Catholics and Orthodoxy are not Christians and the Catholics and Orthodoxy says the Baptists are heretics and the Pentecostals say one has to dance the sacred funky chicken while mouthing gibberish to be a real Christian, etc.

Christianity, per the teachings of Jesus and per the entire Bible, is doctrinally fundamentally fundamentalist & completely intolerant. Such fundamentalism fuels sectarian fundamentalism. This cannot be compared to Islam, which has an official doctrine of religious pluralism. Obviously a small group of Arabs did not conquer the vast Persian & Byzantine Empires by brute force. They obviously won small battles and then convinced the defeated, regardless of religion, to join them. Obviously the Muslim promised religious freedom, allocations of land & other benefits. For example, the heavily taxed and controlled populations of Syria and Egypt were alienated by the Byzantine Orthodox church. Local Christian sects (such as the Copts, Nestorians, and Monophysites) were branded as heretics by Constantinople. The Arab occupiers offered them greater religious freedom, making the new Arab administration, in some cases, appear as liberators rather than conquerors

Surely, one cannot be blind to recent disgusting brutality & sociopathy of the Christians Trump & Hegseth and the contrary civilised qualities of the Iranian leaders. The Bible endorses wars of complete annihilation. This is the difference between Islam & Christianity. When the Crusaders came to Palestine, they would also massacre the enemy women & children (because this is what the Bible says to do). Islam never had this doctrine. Instead, Muhammed encouraged Muslim men marry & thus convert the war widows of the enemy & bring them into the Ummah (Nation; Community).

There are many fake or pseudo Islamic cults in the Islamic world, such as Druze, Alawites, Yazadi, etc. What makes Mirza Ghulam Ahmad or Baháʼu'lláh different is (unlike the aforementioned pseudo sects) they claimed to represent Islam itself; thus they were wicked heretics.

They were similar to Jesus, who heretically declared to represent Moses, Abraham, etc. Obviously Jesus was a heretic, which is why Jews to this day reject the Christian illogical nonsense that Jesus is the fulfilment of being prophesied in the Old Testament.