We are doing a series on the history of Christianity at the UTAS Christian Union. As much as time and energy allows, I am trying to engage with some primary sources, rather than just Wikipedia pages and general 'introduction to church history' texts.
At our first 'Citywide Gathering' we did the topic 'Did the Early Church Invent Christianity?'. As a part of that I read a bunch of theories claiming that Constantine basically created Christianity as we know it today in 325AD, suppressing the more diverse and pagan Christian spiritualities of the previous centuries and burning their texts en masse.
So I read every extant primary source related to the Council of Nicaea. And was bowled over just how little evidence there is for these theories. At all. For theories that are so widely reported and repeated in various ways, there is basically nothing at all. It's all an exercise in speculative reading between the lines. It genuinely is a paranoid conspiracy theory of the 'the 1969 moon landing never happened' or 'the American government did 9/11' or 'the world is ruled by Illuminati lizard men' variety.
I mean Constantine didn't really even get the theological issues at stake. He tried to get both sides of the Arian Controversy to kiss and make up and just stop talking about it. And even after Nicaea he kinda changed his mind and started supporting the Arians more than the Nicaeans.
There are some objections to Christianity that really tie us in knots a bit. This isn't one of them.