I can be cool with anyone but I can only truly be comfortable with nonbelievers. There are like two exceptions but they are with people I've know over ten years.
Depends on the religion.
I'm cool with all my Buddhist and Muslim friends in Thailand because they never try to attack me with religion.
I even sometimes join Thai friends and/or students in Buddhist temple events.
Photos: 1-2Thai students teaching me traditional Thai dance moves as we dance our way to the Buddhist temple for meditation and a feast afterward, near Ranot, Thailand
3 Selfie inside temple after meditation
4.Students having feast in temple after procession