God didn't say anything, Theland, because he/she/it doesn't exist.
I've never found it necessary to give up my friends due to religion, Nailit. My best friend when I was in Sheffield was a Methodist lay preacher. My current best friend here in Suffolk is a practising Roman Catholic, who devotes much of his spare time to theological studies.
On the other hand though, I have long minimised my contact with most of my relatives. Those on my father's side (most of whom are dead now anyway) were of the ultra-traditional C of E type. (For example, my aunt and uncle gave up listening to 'The Archers', after many decades of doing so, when a gay couple were introduced into Ambridge). Many of those on my mother's side are strongly into the 'happy clappy' Baptist churches. I find it best to steer clear of them, as they wouldn't appreciate the mouthfuls of abuse that I'd really like to throw at them.