There is a very good reason why families and communities want everyone to marry someone of their own religion, in often, denomination. Because it is more likely to lead to adhesion and less questioning.
My mother was Protestant, my father from staunch Catholic family (oh the irony, originally 'extreme' Protestants, aka Huguenots) - the reaction from both families certainly made me question how they behaved and reacted, a lot. DH comes from a very mixed family, other Christian denominations (Methodist and Baptist) and Islam. We both came to the conclusion very early in life that it was, sorry, but a lot of nonsense and led to more division and discrimination, cruelty even, than any other cultural or even colour, differences.
Dawkins helped making sense of it all. I am a humanist, through and through, and so is he.