I am an athiest while wife believes in god. Problem is when she wants our 4 yr boy to believe in God and Temples. Talking to her hasn't helped either. Poor child is being fed with unscientific and centuries old fictitious lies! What to do?

Both of you are wrong, and right. You know neither of your thoughts are true, or she knows if her gods exists. It's all a myth, including science and souls, you're a speaking rock in the galaxy of stones. In short, don't force your thoughts. Share good things of science, and let her share good things from her world. After-all, it's about learning the good things, from heroes or villains. Let the kid judge on his own, and enjoy his own independence. Teach him humanity, nothing else matters. Hope I make sense.