Hmmm, I'm always surprised when people use the word "technicality" to mean "uncomfortable truth"! If you cite Bruno as a victim of oppression of heliocentrists, and I point out that he wasn't persecuted for his heliocentrism at all, then I don't see how that's a technicality. On the contrary, it's the whole point. You might as well say that there are black people in prison right now, therefore the government persecutes black people. Yes, Bruno was a scientist (well, sort of, he was really a philosopher who accepted Copernicanism, not a scientist like Galileo) and a heliocentrist, who was imprisoned and executed by the Catholic Church. But he wasn't imprisoned and executed
for being a scientist or a heliocentrist, any more than black prisoners are in prison
for being black.
Can you provide examples of such promotion?
The most obvious example is the use of the Jesuit order to collect astronomical data from around the world with the aim of determining the truth (to the extent that it could be determined, bearing in mind that the Catholic Church in those days adopted the same position towards scientific claims as modern scientists, namely that they are only models) about cosmology. Riccioli, Grimaldi, Kircher, and so on.
I'm sure I could find lots of Gnostics today as well, or temples to Jupiter, Mars, and Minerva. Oh wait, I can't... because they were all destroyed!
In fact, you really could find all those things today. There are certainly plenty of Gnostics. But I don't see what that has to do with the issues at hand. I didn't deny that the orthodox party in the church set about trying to eliminate those it regarded as heretical. My point was that that attempt did not begin with Constantine.
The reality is that once (orthodox) Christianity became officially sanctioned by the Empire, it took revenge for 300 years of persecution by systematically eliminating all pagan religions, and then turned on non-orthodox versions of itself.
I'm not sure how that really addresses the dispute. Yes, orthodox Christianity did indeed turn upon both pagan religions and heretical versions of itself (or, at least, what it regarded as heretical) after being officially sanctioned by the empire. However, I don't see any reason to reduce this simply to "revenge" for anti-Christian persecution; rather, it arose quite naturally from the understanding of orthodoxy and religious history that people had in those days. Furthermore, those who regarded themselves as "orthodox" had
always attacked those they regarded as "heretical". You can see that not only in the works of Irenaeus and Tertullian, whom I already mentioned, but in the New Testament itself. So that sort of thing was hardly an innovation of the Constantinian era. And the thing we're meant to be arguing about here is the myth that Christianity as we know it was an invention of that era, of the Council of Nicaea in particular, and of Constantine himself above all. Which is simply ridiculous.