Will Christianity be remembered as mythological folklore in the future like the Greek and Roman gods are now?

Given that almost every culture has some form of religion in it, faith is probably an unavoidable side-effect of the human condition. In which case the major religions will be replaced by either some sort of non-specific Deism, or other religions. It is likely that C, I and J, along with Hinduism, will still be popular for hundreds of years.