Both the Sabbath and Havdallah are Jewish customs. But I understand you just assume that purely accidently they gathered on days that accidently were "Jewish days"? Maybe Jesus never kept any of the feast either. He just purely accidently was there at that moment and just enjoyed the party.
It does prove one thing, the new Christians did keep Jewish customs.
Not sure WW how far you take that statement- so please regard this post in the context of the whole conversation thus far......
The fact that they gathered on the Sabbath for these meetings does not prove that all the early Christians kept Jewish "customs".
Historical writings clearly show that the early Christians just worshipped on the Sabbath by Jews in the same synagogue at the same time, listening to the same teachings. Yeah, they had their arguments, but still were very many Jews. The early Christians were just Jews who believed Jesus was the long awaited Messiah. The "normal Jews" believed Jesus was not. It's no different than for example, some Christians believe the end-times happened around 70AD while others believe it has yet to come.
Anyway we had this chat before. There is simply no way to convince me all Jewishnes is replaced by Christanity the moment Jesus rose from the dead. If it was, then why is Revelelation on of the most Jewish orientated books of the whole Bible? I know there are a lot of verses that support the OT should be in the trash bin because it's obsolete. At least they seem to support so. But not if 'you' really look at the verses. They are crammed with references to Jewishness.
If it looks like a duck, swims like a duck, and quacks like a duck, then it probably is an elephant....
The Sabbath was there long before there were jewish people---Sabbath was a jewish custom--but long before the jews came about the Sabbath was there at the beginning.So it was hnot only for the jews when they came on the scene--but for all mankind