It is true that Christianity was growing exponentially within Rome during the 3rd and 4th centuries, and that Constantine was, in classic politician form, simply acknowledging events on the ground that had long been happening. Likewise Theodosius established Christianity as the state religion as Christians became a supermajority. The story that Constantine's conversion somehow enabled the spread of Christianity is a myth.

However, I have never heard anything about a Jewish family structure being an attraction of Christianity. If anything after the first century Christianity was much more a Greek-influenced religion.

Could you expand on what you mean by "jewish adopted family" structure? Is there something special about the way Jewish families were organized that led to rapid conversions to Christianity?

Can you describe this family structure? I honestly don’t know what you’re talking about.

> "Jewish adopted family structure"

What? I don't think that had anything to do with Christianity becoming a political force. Citation, please.