I missed what happened. Why are we talking about atheists?
You can be an atheist and an omnist. And you can also be a Christian and omnist. It's not really a religion, it's just the belief that there's a good reason people believe in stuff, even if you don't agree with some of it. If you're religious then you believe "in a single transcendent purpose or cause uniting all things or people" If you're non religious you believe "There may be an influence more akin to existentialism in which consciousness is a power or force that helps determine the reality, yet is not a divine influence."
It's just a good way to destroy any feelings of intolerance and hatred for me, personally. Trapping yourself into something and becoming more narrow-minded and stubborn as you grow, just doesn't feel right. Realizing that most people, down to their core are essentially one in the same, is a good feeling to have.

Our worldviews, values, uncertainties, fears and dreams make up so much of our reality, to deny any one person's views would be...ehhh, troublesome.