The Winter Solstice. Sunrise services being meant to worship the Pagan Sun God, and snacking on a chocolate fertility symbol. And Samhain. I am fond of Samhain, and rather irritated that some are now requesting children not be allowed to wear halloween costumes to school.
It is an intertwining. 12 religions have the same Golden Rule, which is an intertwining as well, and a rather beautiful one I think.