I want my bf to join me and my family at service on christmas eve.
Does he want to go to Christmas Eve service with your family?
No, but I think it's important for him to come.
I understand why you'd want him to spend that time with you and your family, but you shouldn't force him to go the service if he doesn't want to. I think you should ask him to come, but if he declines, then you should respect his choice.
He shouldn't need to come with me. I'm choosing to go so he has to come.
It is wrong to force someone to do something against their will. They may resent you for this if something happens when they are there.