Constantine1&2 Established Christianity as the official religion, but he did so by including the Trinity into the official religion. The Trinity is unsupported by the Bible and since Constantine was pagan the concept of Trinity would have sat easily with him. This situation would also go a long way to explain why so many Christians might believe in the Trinity today - due to church tradition.  Note the Trinity concept was formulated as a political solution to Constantine’s problems of stabilizing his empire through compromise on religious issues—This Is-An Additional Note Sent in by a Reader..

Constantine1&2 Established Christianity as the official religion

The Senate in Rome was a pagan dominated organization. They welcomed Constantine in Rome by declaring him chief Augustus and Pontifex Maximus, (Pontifex maximus ) that is, high priest of the pagan religion of the empire. Constantine was not a Christian at the time of the Council of Nicaea. The Encyclopedia Britannica reports: “Constantine himself presided, actively guiding the discussions, and personally proposed . . . the crucial formula expressing the relation of Christ to God in the creed issued by the council.”

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Below is a Sample From http://en.wikipedia.org/wiki/Constantine_I_and_Christianity

Constantine's vision

The traditional story of Constantine's conversion is presented as Constantine seeing an omen in the sky whilst marching along with his troops — in front of the sun, the shape of an ambigram cross with two Greek letters, chi (Χ) and rho (Ρ) (the first two letters of the Greek ΧΡΙΣΤΟΣ, Christos, or Christ) along with a Greek inscription reading "Εν τούτω Νίκα", En Touto Nika (meaning "with(in) this win"), which is often translated into the more familiar Latin: In hoc signo vinces (meaning "in this sign thou shalt conquer") before his victory in the Battle of Milvian Bridge on October 28, 312.

Either upon seeing this vision or upon being instructed to use the emblem he had just seen as a standard in a dream afterwards ^{[citation needed]}, Constantine is said to have instituted a new standard to be carried into battle, the labarum. Another major religion of the time, Sol Invictus, also used a similar symbol. ^{[citation needed]}

There are at least three different surviving ancient versions of this battle in greater detail, not all of them are by prominent Christian apologists:

· Panegyric of Constantine, sees the vision as from Apollo as Constantine's patron (Panegyrici Latini VI (7), 21 from 310);

· Lactantius, Of the manner in which the persecutors died, 44;

· Eusebius of Caesarea, The life of Constantine, 24-31;

· Zosimus, New History, 2 (43,44) (this version seems to have numerous owls as an omen of victory, and is by a hostile pagan).

It should be noted that historical sources of the 4th century Roman Empire seem to be unusually rich in omens, magic, hexes and spells, while lacking in critical inquiry.^[3] A suspicion of literacy and higher learning which began at least a century before had grown. These may have been the results of the fear and high mortality rates caused by the first and second outbreak of the Antonine Plague (165 - 180 and 251 - 266 respectively).

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