You confuse me with someone who is a proponent of organized religion, of which I am not. But your analogy is silly because it implies a parent would be irresponsible enough to let a child go wielding a handgun unsupervised. And somehow this translates into letting a child go unsupervised in matters of religion and go out and cause extreme harm to someone. And when was the last time an eight year old kid caused irreparable harm on anything from something they learned in church?
So hence, your point is quite silly. Probably best to drop it, it's not going to get any better for you.
But you already said your children are not old enough to be able to determine for themselves, so how do you know for certain they would be asked not to come back? But the question could be phrased differently I suppose...
Have you ever asked your children if they want to go to church? We're making this all about the kids and what they want to do, have you ever posed that question of whether they might like to attend?