Honestly, I don’t think you any person an explanation for things like why you don’t go to church or even why you need space from them. It sounds like you would like to keep the friendship but at more of a distance. I think whether you block his number or not, he will eventually get that you need your space. Most people do. I am having an issue with boundary setting and I have to balance myself so I don’t go from either allowing someone to be way too much in my space... to blasting them so they go away... it sounds like you’re doing a good job balancing that you want your space and you’re doing it in a kind way. This is what I want to learn to do better. Best of luck and I think it will work out.