During the 4th century, the main split in Christianity was over the relation between God the Father and God the Son, and whether the Father created the Son. Emperor Constantine told both sides that it was "extremely trivial" and a "very silly question." 
The belief that the Son was created by the Father is called Arianism, and while it is rejected by all modern dominations of Christianity, it was the religion of many of the Germanic kingdoms, including the Goths and the Vandals.
Constantine was probably a henotheist, worshipping Sol Invictus exclusively, before he converted, and he probably came to believe that the Christian God and Sol Invictus were the same. Most of his Imperial propaganda was just generically monotheistic.
Constantine wrote a 26 chapter speech on Christianity, in which he argued that the natural world proved polytheism wrong, as with multiple gods the world would be plunged into anarchy; "The constellations would be in disarray, the seasons could not change in consistent patterns."
Constantine made no effort to force conversion to Christianity, which he believed a matter of private faith, but he inflicted brutal punishments against both corruption and private immortality.
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