OK, so you are assuming that your W agrees that your S should be participating in the church the way you would wish?

I'm not saying she doesn't agree, I am asking that you are confident that she agrees. Or is that a convo you need to have with her, first?

+ Does she agree, or not? That needs to be determined.

+ If she does not agree, then... well... that needs to be figured out IF that is the case.

+ If she agrees, then is the church part of the birthday celebrations, or is it separate from family b-day celebrations?

+ If it is separate, then you'd need to figure out if your W wants to participate in the church ceremonies or not.

+ I understand that sometimes this is between the son and the father and the church and everyone else is just witnesses. In other cases, it may require both parents to participate in the church portion.

This may not have anything to do with your W, except that she would want to be kept updated and know the when and where of it all. With pretty much everything up to you, anyhow.

So lets start with the above to determine what your responsibility is, around this.