Why do Christians become Christians?

[SteveII]

Of course people are primarily religious because it's an emotional crutch rather than due to an interest in the truth or even as a concern for intellectual pursuits. And they fail to recognize that questions of morality and meaning are better approached through philosophy instead of the priesthood, which tends to focus on the few instances when "divines" said something awe-inspiring and true rather than the overwhelming examples of division, egotism, theological hatreds, and falsehoods, which tend to be indistinguishable from the utterly delusional.

So your answer is that more and more people every year, for 2000 years, are either 1) not concerned about the truth, 2) deceived and fail to detect the deception. 

Your statement that Christianity contains "overwhelming examples of division, egotism, theological hatreds, and falsehoods, which tend to be indistinguishable from the utterly delusional" does not line up with the teachings of the NT (and therefore not Christian). So, in fact you are talking about individuals who exhibit these qualities who are not following what it means to be a Christian. An important distinction. 

In general, you are ascribing motives and reasons for people's beliefs when in reality, you do not and cannot know.