slimboyfat,
What I provided was the internal evidence. Jesus came to reinforce the Law and urged more ‘violent’ or intense action. (Mathew 5:17; 11:12)
Yet much more striking is the external evidence. Teaching of Grace was very prominent in Mithraism, and Church Fathers feared that people might suspect later that Christianity borrowed from pagans, hence they blamed it on Satan (as though he is teaching truth well in advance through pagan leaders so that future generation would see no value to truth when it arrives through Jesus); hence Tertullian wrote:
"The Devil, too, baptizes some that is, his own believers and faithful followers; he promises the putting away of sins by a layer (of his own); and if my memory still serves me, Mithra there, (in the kingdom of Satan) sets his marks on the foreheads of his soldiers; celebrates also the oblation of bread, and introduces an image of a resurrection, and before a sword wreathes a crown.
What also must we say to (Satan's) limiting his chief priest to a single marriage? He, too, has his virgins; he, too, has his proficients in continence. "
– Tertullian, The Prescription Against Heretics