I am not saying that at all. Constantine decided what books would be allowed and those that would not. He accepted Christianity, but on his terms.
Constantine had nothing to do with the Canon of scripture. That is a myth from The Da Vinci Code. https://historyforatheists.com/2017/05/the-great-myths-4-constantine-nicaea-and-the-bible/
You are not even right about Constantine having anything to do personally with determining the New Testament canon. At most, he asked Eusebius to prepare 50 copies of the New Testament, none of which we are sure have survived. The record is that he was deferential to the “experts” of the church as to the substance of Christianity, not that he was trying to dictate it.
https://biblequestions.info/2019/09/21/did-emperor-constantine-create-the-canon/