"The Roman Catholic Church, in its pagan form, unofficially came into being in 312 A.D., at the time of the so-called "miraculous conversion" to Christianity of the Roman Emperor Constantine. Although Christianity was not made the official religion of the Roman Empire until the edicts of Theodosius I in 380 and 381 A.D., Constantine, from 312 A.D. until his death in 337, was engaged in the process of simultaneously building pagan temples and Christian churches, and was slowly turning over the reigns of his pagan priesthood to the Bishop of Rome. However, the family of Constantine did not give up the last vestige of his priesthood until after the disintegration of the Roman Empire -- that being the title the emperors bore as heads of the pagan priesthood -- Pontifex Maximus -- a title which the popes would inherit. (The popes also inherited Constantine's titles as the self-appointed civil head of the church -- Vicar of Christ and Bishop of Bishops.)
Prior to the time of Constantine's "conversion," Christians were persecuted not so much for their profession of faith in Christ, but because they would not include pagan deities in their faith as well.
That is totally false. Your website is a bogus source.
This Catholic Encyclopedia passage is based on unquestioned historical evidense:
"Christians from the very beginning adorned their catacombs with paintings of Christ, of the saints, of scenes from the Bible and allegorical groups is too obvious and too well known for it to be necessary to insist upon the fact. The catacombs are the cradle of all Christian art. Since their discovery in the sixteenth century — on 31 May, 1578, an accident revealed part of the catacomb in the Via Salaria — and the investigation of their contents that has gone on steadily ever since, we are able to reconstruct an exact idea of the paintings that adorned them. That the first Christians had any sort of prejudice against images, pictures, or statues is a myth (defended amongst others by Erasmus) that has been abundantly dispelled by all students of Christian archaeology. The idea that they must have feared the danger of idolatry among their new converts is disproved in the simplest way by the pictures even statues, that remain from the first centuries. Even the Jewish Christians had no reason to be prejudiced against pictures, as we have seen; still less had the Gentile communities any such feeling. They accepted the art of their time and used it, as well as a poor and persecuted community could, to express their religious ideas."