deegee, you completely misunderstood me. I wasn't talking about whether or not Constantine chose Pauline Christianity. I know this is what you were talking about, and I'm fine with that. What I was talking about is whether Constantine wanted to bring unity and peace to the Empire by converting to Christianity. This is wrong. This is what I was talking about. I was debunking this, not whether he chose Pauline Christianity. Constantine did not convert to Christianity in order to bring peace and unity to the Empire. Any critical scholar to my knowledge would tell you that.
By the way, since I'm already responding to your misunderstanding, I need to address two myths that you either stated as facts or implied in your post (which then I may have misunderstood):
1) You say that Constantine made Christianity the state religion. Here is a quote from your post:
Constantine caused the survival of Christianity, having made it the formally recognized state religion and the recognized format was Paul's religion.
This is completely wrong. Constantine did not establish Christianity as the state religion. This is a very persistent myth. Which is completely and utterly wrong. (Where do people get these ideas from...?)
2) In the below quote, you seem to be implying that Constantine instituted the Council of Nicea in order to bring harmony and unity to the Roman Empire. (This is how I at least understand it because of your use of the phrase "For that reason.")
Constantine became closely involved in it, bringing with him the Roman desire for harmony and unity. For that reason, he instituted the church-wide Council at Nicea, its task being the setting of the date for Easter.
If this is what you're implying, you need to know that the Council of Nicea was not about bringing "the Roman desire for harmony and unity." It was about establishing consensus on the nature of Jesus as Christ (which you yourself say in your post, so I'm not sure how you got the thing in the quote above so wrong...)
On a further note, you seem to be using Doug Mason as your source. Keep in mind that he is just an online blogger whose desire is to debunk the Watchtower (which is fine with me.) But if you're gonna use him as a source for actual history, then I don't know why I even bother to talk to you. If you said that Constantine established Christianity as the state religion (which is a myth and everybody who has ever studied history knows this) because this guy Doug Mason wrote so, then you should consider stop using him as a source. If someone thinks that Constantine established Christianity as the state religion, this is a big—and I mean a BIG—sign that he or she knows nothing about history. Literally nothing since this is basic stuff...
Edit:
the Roman desire for harmony and unity, this time within the Church, manifested itself in 381 CE when Emperor Theodosius instructed that Arianism was not acceptable
Nope. Roman desire for harmony and unity...? Again...? Nope. It was only about establishing a united Christendom. (And saying that "Theodosius instructed that Arianism was not acceptable" is an understatement :D)