A cynic would conclude the Post Office, under huge financial stress, took the expedient route to revenue: tap into the guns and bible crowd and sell more stamps.
That was my first thought too. regardless of how “unconstitutional” they may find this.
>> “tap into the guns and bible crowd and sell more stamps” <<
I can see your logic, but the reality is that christmas isn’t Christian, its commercial. They simply need the revenue.
Christ’s real birth date was at Yom Kippur, and his family didn’t migrate to Egypt on either date.