The best part about religious services was that the instructors didn't follow you there. You got to walk to and from these services with other candidates. For me, it was more social hour.
The first week I went to a Buddhism service, but it was in a cold trailer and I was cold too many other parts of the day. Weirdly enough, I learned about an MOS that sounded cool to me while at this service, and I ultimately ended up getting it after TBS.
I loved the Protestant services. I was raised Catholic but I'm not religious now. This service was run by the two Chaplains. They would let us sleep, do our essays, or study. They posted sports scores and had candidates play music. You could sit with any candidate. I would try to get notes to my friends in other platoons to come to service with me so we could catch up. It was really chill. The only thing that wasn't allowed was disrupting and talking. You could whisper, but I preferred to write notes to my friends in my notebook which I still have today. I hated when some of my friends would talk loudly. I would move away from them.
I did actually pay attention to the service, and I always made sure to talk to the Chaplains afterwards. It was really nice of them to have such a safe space.
Off the top of my head, other services were:
Catholic
LDS
Judaism (sometimes)
I think there were around 8 different ones to go to. You sign up for them the day before. Or you can choose to hang back in the squad bay. I only did that once, to help a friend study.
Services are one of the first things you do when you get back from liberty. They are usually Sunday night. Saturday evenings and Sunday mornings are liberty times, and one of the roles of the Chaplain is to facilitate you finding religious services, either on base or out in town. You can definitely go with your liberty buddy!