People who profess to be atheists, and then have children strike me as the worst sort of person. And not even people who profess atheism. Too many people are religeous only insomuch as its a cultural tradition. Their reasons can only be rooted in cowardice, stupidity or utter selfishness. To create life is to kill it. Unless you have some strong religeous conviction.
Having children is, in such a situation, a worse crime than murder. Murder merely hastens the inevitable - birth on the other hand creates something that can only later be destroyed.
I have more respect for the 9:11 terrorists than I do for atheists. Terrorists at least kill because they belive in something.