Yep, even history's calendar is based on Jesus' Birth.How do we know about anything that happened a long time ago in history? We know because people wrote it down. There are a pile of ancient texts that discuss Jesus the person. Both of Jewish and Roman authorship, and within a short time frame after his death. Believe what you will about the claims Jesus made, but it is a completely ridiculous position to say there is more evidence for Bigfoot than for Jesus.
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