If you live your life as if there is no God, for your sake you better damn well be right.
There's a corollary to that: If you believe that there is only one denomination, sect, or faith tradition that is 100% the only one to pick, then you had better well have chosen wisely.
Not every atheist is anti-Christian. We may not have chosen as you have, but generally, we celebrate your right to make your choices freely.