For starters those are HIS beliefs. You have YOUR own. You can disagree with his and he can disagree with yours. The point you're missing is that you do it politely. Address the message not the messenger.
As for this....
He believes that secular schools, secular holidays and secular town squares are an assault on his religion, but making them places to celebrate religion... sorry make that "his" religion, is OK, and is not an assault on my freedom, even though I am forced to pay for those places, and can only use them under the auspices of his religion.
Last year my son's secular school/public spent a week on each religious holiday in his kindergarten class. I personally thought it was a good idea so that the kids learn early about DIVERSITY and RESPECT for one another's religion.
Novel idea don't you think?
For those who understand no explanation is needed, ...For those who don't none will.