This thought just occured to me: Faith is the willingness to believe something which cannot be proven, hence, atheists have faith in the thought that there is no God.
If a religion is based on faith, or if a person has faith in God, then one should acknowledge that there cannot be a way to prove that said religion is correct, or that God exists.
More reading (Please note the following: I didn't write any of the content from these links. I take no responsibility for hurt feelings, insulted intelligences, offended vocabularies, or out-of-style hairdos. I won't respond to flames, either.):