I think that if a person has enough knowledge, they are entitled to whatever their knowledge can get them - unless, of course, that violates law/human rights (thinking child murderers/scammers/con artists here, not your child). Maybe ask the elders to give him a bible studies test, since you may be a little biased, as a parent, towards your son, but by all means go for it! What would be good, however, is ensuring that he gets a decent education of all other religions before signing him into one, so he can choose for himself and also be tolerant to other beliefs. Also, let him be a kid, and play and have fun without signing into an organisation that he may regret later. I hope you have a nice evening!
I’m an atheist, so it’s ok if you don’t want to use my response