You've never heard of a festival celebrating the coming of Spring?
I mean, the Chinese have one. It's called Spring Festival.
Celebrate the arrival of spring with some of the most unique traditions from around the world. Here’s a list of how 12 different countries welcome spring!
www.littlepassports.com
"12 Spring Traditions Around the World"
others if you want to look.
Passover in Judaism is called Pesach, Easter is also called Pascha... coincidence? I think not.
en.wikipedia.org
"In Latin and Greek, the Christian celebration was, and still is, called
Pascha (Greek: Πάσχα), a word derived from
Aramaic פסחא (
Paskha), cognate to the Hebrew פֶּסַח (
Pesach). The word originally denoted the Jewish festival known in English as
Passover, commemorating the
Jewish Exodus from slavery in Egypt."
Christianity took over festivals that already existed. Even if you believe Jesus was born, he wasn't born on the 25th December. It was just the winter solstice festival.