Bless you or no bless you

Angela? • I`m a stay at home mom ttc #3
I was raised Christian but as an adult I am not religious, I'm a spiritual person I believe there is a god but more universal. My husband was not raised in a religious house hold and he believes in a god just not Christian or catholic God. Anyways I always say bless you after someone sneezes and now my 3yr started saying bless you after he hears someone sneeze, my husband hates it! we can't see eye to eye on this. I think it's just a polite thing to do shows manners however my husband saids it's a religious thing and he wants nothing to do with it, he never saids bless you and doesn't want our son saying it either, I think it's rude not to. I don't even say God bless you, just bless you. What to do?