Christianity is diverse Orac. This is because before the Reformation the only people who could directly address god in prayer were the saints and the priests of the church. Kings and rulers had to allow the church to administer earthly power- Church Law was the most important and laws passed in parliaments had to be ratified by the church authorities in Rome.

After the Reformation the people who protested (now known as Protestants, Lutherans, Calvinists etc,.) were able to speak to god on their own behalf, without the intercession of saints or guidance of priests, and they were also able to read God's words for themselves in the Bible. This means that people can make up their own minds on the interpretation of the teachings in there.

This is the process that continues today. Each church has its set of dogma, some believe in the End of Days, others don't, and it is not necessary to formally join a church to worship. The point is that there is no longer a 'correct way' to be a Christian, other than deciding that the teachings of Jesus should be a foundation- and even that seems to be optional in some churches.

I suppose that the link between al-Qiymah and Christianity possibly lies in the fact that both (plus Judaism) have the Old Testament books as contributing to their holy writings, and certainly there are some stirring prophesies in them-- also the Book of Revelations in the New Testament is crammed with prophesy and would have been familiar to Muslims over the centuries too-- perhaps. Do you agree?