I'm not muslim/arab and I have been using various phrases such as inshallah, mashallah, yalla, habibi, cheb etc since I was a teen, as its part of the melting pot slang of arabic/creole/whatever else in my city.

I just figured it was a mix of memes, and the fact that arabic is reaching a certain level of ubiquity that it was bleeding into slang like other immigrant languages have over the decades. Most of the time I use it unironically without thinking, but sometimes I do break out the arabic to trigger some chuds on purpose.