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Santa is based on Saint Nicholas of Myra, so he definitely has something to do with Christianity.
The modern depiction of Santa is based on Coca-Cola.
They popularized it, but didn’t truly invent the classic depiction. Related fun fact, Santa used to commonly be green, and he looks pretty cool that way too!
“Based on” and what people associate with now are vastly different. Most people don’t even know if Saint Nick is based on a real person.