Most people are born into religions.  They 'believe' because of social pressures. - People who are born into religion have moral training and respect for authority that others don't. People believe what they believe because they believe it. However, they might act the ritual of a particular religion without believing all of it, because their parents brought them into the religion.

Nothing to do with reality or what is true and what is not. - However, nobody knows the complete truth. And nobody knows exactly how much of each religion is truth. And, some part of all religions are truth, or people wouldn't be able to exist in them at all.

People who actually care about the truth, discover that religion is a bunch of nonsense and become atheists. - The only essential truth of the atheism religion is, most so-called atheists have not thought about the fact that they don't KNOW that God doesn't exist, and that, therefore, they are not really atheists. Rather, they simply think that they are following the idea of atheism. Often they subconsciously know that something is wrong with the way they are thinking, but because of certain psychological problems, they adamantly deny the way they feel.  This makes atheism to be the most pathetic religion of all, so-called atheists not even realizing that atheism doesn't exist, and that they have a religion in whatever it is that they have that they call atheism.