Atheists can and will try to create an atheist version of religion; it is a simple fact that religion feeds our spiritual nature in a way that pure science cannot. So let the atheists try, and we will all see what happens. While Christianity is very powerful, it is also oppressive against gays and lesbians. In contrast, New Age religions are much more loving and tolerant, but they are not as strong, and are easily watered down. I have been asked by spirits: which religion is better? I honestly don't know. I believe that Christianity is strong and it allows smaller more tolerant religions to exist. I believe that atheist versions of religion will be tried, but will ultimately fail because they lack the most important ingredient: spiritual power.
Look, I get that the universe can often seem like an empty and meaningless place, completely indifferent to life and consequence. I get that many if not all humans feel a subconscious drive to give some sense, meaning and personification to the universe by projecting their own ideals and conscious thoughts as if there were a supreme creator who felt the same way. All the same, how can we possibly equate fantasies invented out of personal needs with solid, indisputable truth? How can you just one day decide upon the existence of a supernatural creator because that's how you want it, and come to any logical conclusion but "maybe, maybe not"?
I've moderated my views on Christianity from where I was when I was younger. I think any sensible interpretation of it that I've ever heard flies completely in the face of observable facts, and I think it's been used to promote a great deal of intolerance and outright barbarism over the last 2000 years. However, I also think there must have been vastly more destructive philosophies in the world at the time when Christianity came into vogue (which is probably why they all died out so long ago), and at least it was good enough to keep western civilization afloat into the modern age. Basically if it makes someone happy and doesn't lead them to try interfering in other peoples' personal lives, then I don't see it as being worse than any other personal indulgence.