I will most likely delete this account so I wanted to tell my story first.
I was an atheist until my early 20s. I tried to prove there was no God, and the weight of the arguments for God (apologetics) convinced me otherwise.
I'm posting this up because fanfiction really is a 'secret life' that I don't want to have secret.
Fanfiction should never take priority over God or cause you to lie. For me, it caused me to have this secret side of me.
Life is short. Super short. Do you want to be living a lie? Or do you want your writing to glorify something other than God?
TLDR; If you're a Christian, don't let stuff on the internet rule over you. Seek God to make sure you're not. If you're an atheist, apologetics is really convincing stuff. Look up people like John Lennox, William Lane Craig, Frank Turek, Norman Geisler and many others on youtube.
God is Holy. Are you?