Good evidence/reasons to be an atheist?

A Christian here, I keep seeing atheists always attacking, not even God in general, but Christianity and this specific form of theism (classical theism). But I wonder if you actually have any backing for your worldview with arguments, because at the end of the day it is a worldview that you think is better. No I'm not talking about agnosticism, active atheists who make the claim that there is no God.