These people are either stupid, extremists, or sheep. They call this "faith". Faith is believing in something that has absolutely no evidence that it is true.
These are the reasons why most people join adopt a religion:
-They are sheep and do what their friends do.
-They are forced to.
-They fear they will die, and in this moment of fear they go irrational and think that a religion that has false or no evidence can have a way for them to live again after death.
The problem is that no religion has sufficient evidence - the only evidence they do have is evidence that has no evidence for itself or is extremely unlikely or false.
But anyways, we shouldn't be deciding your religion for you. Find whichever one fits you best or find no one at all.