The grace only idea has been around for a while, Emperor Constantine was champion of the grace only doctrine. other Christian sects told him their way meant he would have to change, no more killing, couldnt cheat on your wife, no more worshiping the sun, etc, but the grace people told him grace covered all that Constantine loved this idea, after all he murdered his own son and had one of his wives boiled alive so he needed lots of it.
Sad thing is that in the end when Constantine was on his deathbed, and finally got baptized, he was baptized by Arius who was not a faith only teacher. So after it was all said and done looks like he never even believed in it.
