Would you call a wellness check on your child?

I had some son at 15. I was in foster care and got pregnant my foster father through assault. I was separated from my son in the system. Forced to sign my rights away and he was adopted out. We met again when he was 15 and his adoptive parents were awful to him. He eventually ran away to my house when he was 17 and I'll be honest. I didn't tell anyone. He just stayed with me. He was a runaway but when he turned 18 it didn't matter anymore. He's 23 now and we have a decent relationship. Then he met this girl. I had very bad vibes about her because she kept preaching about this amazing group she's apart of. The group is apart of a church but it's on separate group from the church. It's very confusing and some of them live in a commune and it's very culty. My son ended up joining this group and changing. I stopped seeing who he was as a person. We had a fight because to be an official member of this church they have to fucking brand you! I told him not to do it. It's dangerous. We had a blow out fight and he stopped talking to me. Then I started getting text messages recently from my son saying he's okay and he's happy. One big thing about my son. He. Can't. Read. He doesn't know how to read or write so he never texts me or anyone. The very few times he does he uses the voice thing and I can tell because there's no punctuation. These texts had punctuation. I know he's an adult but I'm scared for him.