Why believe in christianity? (atheist)

I’m an atheist, but I hope it’s ok if I post on this subreddit. For context, I’m a 15 year old autistic gay trans boy with social anxiety and am being raised in an atheist household in the most irreligious country in the world. My mom is an immigrant and was part of the salvation army up until I was about 3 years old and then left christianity mainly due to inconsistencies in the bible. My dad was raised roman catholic but was never really practicing, but remained agnostic due to Pascal’s wager. A few years ago he too abandoned christianity completely and now identifies as atheist.

With the recent elections in the US and no evidence for god existing, why do you believe in christianity? And in extension, why should I believe in christianity?