Question: If the idea of God can be dismissed as a memetic parasite trying to survive, then any idea can be dismissed the same way--including atheism. The idea of rational thought would itself be a meme. The idea that there are such things as memes would be a meme. Rational thought breaks down entirely under such as system as we could have no way of knowing whether any thought we have has any relationship to reality at all.
Answer: No, you're conveniently ignoring the fundamental difference. EVIDENCE! Using reason, rationality, critical thinking and common sense based on empirical evidence that is testable, repeatable, and subjected to the rigorous scrutiny of peer review.
It's interesting that theists attempt to portray reason, atheism, and even science as a religion. Subconsciously they know the very word "religion" is delusional, divisive, disingenuous and dangerous. It's a fascinating 'panic' defense.