What you believe in is made
What you believe in is made up. Somebody made it up, at some point, be it you or whomever came up with it. This is specifically why atheists skip believing in the unprovable and render it impossible to determine by default.
We’re not anti-christian, we’re anti-claiming to or living as if you have the slightest fucking idea about a supernatural realm, life after death or what pleases/is God.