He Answered; 'God is B*llocks!'?

I think he is essentially correct and its as valid an opinion as anyone elses. His way of expressing that could be more diplomatic but he is only eight. As a parent I'd talk to him in a non critical of his view way about how to express himself more appropriately in such settings and that a variety of beliefs exist so he has to take others views also into account. Religious people could often use that lesson themselves.