My academic background involves having spent far too much with the source materials around this and between that and my upbringing, I have a bit of knowledge.
I don't think his historicity really matters. The texts of the Bible are culturally very significant text and their use over time by different powers still shapes the world -- and the edits, selections, canon choices, choice in formatting, choice in translation, the destruction and mishandling of texts which has left us only fragments and the uses of the texts are all very human and much more interesting to me. The way people use them are why the texts have that influence, both that have a historical thread and those that absolutely don't.
It's similar to the archaeological evidence - it does give credence to some of the historical threads in the Tanakh, but it also shows a much broader picture and significant evidence of things beyond the scope of the texts. We have strong evidence that early Judaism and even some in Christianity was monolatry - worship of one deity without the denial of others - that remains in small pieces in the texts. We also currently have the debates on evidence like the ones about whether inscriptions like "Yahweh of Teman and his Asherah." refers to the Asherah goddess discussed in the Bible (from King Josiah's reforms on, there is a very negative bend in the texts against her, he was very much everything needs to be monotheistic) or an object or grove of trees or something else. The evidence outside of the Bible is there, doesn't change anything about the texts to me. They're interesting, human stories, shaped and reshaped over centuries to fit the narratives.
I’d say that at the time Jesus broke the status quo because he had female followers.
There were many Jewish messianic cults at the time - people wanted out of Roman occupation and many Jewish groups have had the view for a while that there are potential messiahs in every generations, just none have succeeded yet to fulfil the requirements. It was not that unique for women to be among the followers of them. That none of the Gospels or other writings attributed to women were accepted into any canons or had much popularity says more about whether the early church was breaking the status quo than figures showing up in the tales who we can see from edits (literally we can see names crossed off and rewritten over) were managed around as part of developing the texts.
Your kids are not Christians if they don't believe Jesus was the the son of God. That is the core defining belief of Christianity
To some, and I can see why Christians who hold that would push back on it as many Christian branches have had it as established doctrine, but it's also within many doctrines that only God can know who really is and isn't.
All faiths are internally diverse and vary over time and place. Jesus being the son of God was not part of all early churches, particularly not literally, and has not been a required part of several church denominations for a while, the Quakers probably being one of the earliest and well-known sects that didn't start off Universalist to shift to that.