I wouldn't worry. Kids are pretty good at differing between how things work in one place contrary to another.
When my son have questions about religion and faith, I always tell him that he can believe in anything that he wants to believe in, that nobody shall tell him what to believe, and that nothing is documented anyway. I keep doing what I do, school does what it does, friends do what they do. I don't hide my rituals, I think that it is more important to let him know and experience them, so that he can see that there are different religions, different paths, and that all of them can be good alternatives to a rich spiritual life and connection to higher forces (or lower for that matter).
I think it is important to take the time and really sit down and talk with the kids when they have questions about these things. Without prejudice, and without restrictions on what is right and what is wrong.
It is not so long ago that we had a conversation about Jesus, the Devil and Thor with the Hammer. We also talked about that Christians believed in one God while heathens had several Gods. He concluded all by himself that he did not believe in the Devil, and therefore not the christian God either, he believed in several Gods. In Jesus and Thor with the Hammer. Of course, I could have told him that Jesus and Thor is a not so good match, but I didn't. I want him to think for himself, and I would not be letting him doing that if I told him that Jesus and Thor actually aren't such good friends normally. I have faith in my Gods, and I am not afraid that they will let my son down. To be a happy heathen today, you have to dare to think for yourself, to be different.
I had another starting point when I was a child, but I landed as a druid heathen. It wouldn't be the end of the world if my son ends up being a christian, I just hope that he will put a druid in front of his religious title