B.C. Actually does mean Before Christ, and the A.D. is the latin Anno Domini, which translated means "In the Year of Our Lord".
So there is no getting away from the religious connotation no matter which way you look at it. That is why modern classrooms now use BCE and ACE - Before Common Era and After COmmon Era. Same time period, just the P.C. police had a stick in their a$$ over this one.
In as much as historical findings, it has been anthropoligically proven. There are records of Jesus's crucifixion (the Romans kept records on all people put to death - Jesus of Nazareth shows up in that list in the suspected time it was thought to happen), and scholars have already found the tomb of the Pharisee Caiaphus, who was the head Pharisee at the time and the main guy who wanted to see Jesus crucified, although everyone had a hand in it to be sure.
Let me see - other things... There is that burial box they found that had the inscription "James - Brother of Jesus" - Anthropologists noted that that was significant, because they never put "Brother of ..." on a burial box unless that someone was well known - this based on other burial boxes that were uncovered. So likely even more anthropological proof for Jesus.
Actually, if you speak with a bunch of secular antropologists who study the area, most will agree there is enough proof that Jesus did exist, did get crucified, and that there is enough of a trail of evidence to suggest that the account of Jesus's travelings around Israel in the Bible are also historically accurate. The main thing now is whether you believe he rose from the dead - that is where you go from anthropology to the bible, although anthropology has yet to find any remains of Jesus. Of course you always got the one or two quacks who happen to "Find the bones of Jesus" about once every 2 or 3 years or so, only to be routinely discounted and discredited by the majority of secular anthropolgists who are more honest about their work.
Another interesting point, albiet off-topic. In cases where people who have experienced the stigmatta, and have had samples of the blood taken for DNA testing, the blood not only was not the same dna of the person who it bled from, but also, the blood from all these different people (the stigmatta'd blood) is all of the same dna type, which is amazing since dna is different in every person. This was something I caught a couple years back on either Nightline or 20/20 when they did an investigation on it - I forget which one...
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Fear is here, where's the beer?
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Fear is here, where's the beer?