As a Christian who doesn’t follow much of the super religious “rules”, I think it’s kind of a red flag but sometimes it’s not. Red flag because my girlfriend’s ex-friend was super devout and put it all over her bio and was very ableist and homophobic. My friend, for example, is agnostic, so he’s not sure if spirituality exists. He has a friend who’s super devout and constantly talks about Christianity. She has a Discord server about Christianity and most of her friends are Christian who just talk about Jesus and God all the time. She puts the crosses and bible verses in her bio too. She’s very nice and tries to be accepting but seems kinda judgmental or like “Oh, your non-traditional ways are… nice I guess.”
She constantly asks my friend how his relationship with God is and if he reads the Bible and what his favorite verses are, even when he says he’s not super religious.
My mom as of recent has become super religious, and while she is pretty left-leaning, thinks the only way to believe is to be Christian and you HAVE to believe in Jesus or you’ll die instead of live forever in Heaven.
I’m from the US southeast so I’ve seen plenty of these people. IMO, they should be avoided. There are plenty of devout Christians that are quiet about it and they’re fine. They’re often good people actually. The ones that are extremely forward about it are performing for their in-group. The in-group is all that matters. Since you aren’t in it, you don’t matter to them. At best, they’ll hang out in order to proselytize to you. I find them condescending and intentionally disconnected from the outside world. Effectively, they’re in a cult.