Holy Trinity and islam propaganda 285

For, for the islamic propaganda, the dogma of the Holy Trinity would have been imposed at the faith of holy Church by emperor Constantin since the concile of Nicea in 325.

So, the mystery of the Holy Trinity is present in the Bible,
in the Old Testament like the New Testament, since the book of the Genesis until this of Apocalypse.
You can to find the citations in the description of that brief the quotes than testify of that.
If then the mystery of the Holy Trinity precedes the concile of Nicea, how saying that this one has invented it ? And how to think than the Church leaving of three centuries of persecution had accepted to deny it for what many of martyrs had shed their blood, at the same moment where the christian's faith, being finally spreaded everywhere, was no more forbidden ?