I've posted this before on the "memorial "threads, but in all fairness....it's good to look at BOTH SIDES
In all other major respects the theology of the two cults were all but identical.
Mithras had had twelve followers with whom he had shared a last sacramental meal. He had sacrificed himself to redeem mankind. Descending into the underworld, he had conquered death and had risen to life again on the third day. The holy day for this sun god was, of course, Sunday; Christians continued to follow the Jewish Sabbath until the fourth century. His many titles included ‘the Truth,’ ‘the Light,’ and ‘the Good Shepherd.’ For those who worshipped him, invoking the name of Mithras healed the sick and worked miracles. Mithras could dispense mercy and grant immortality; to his devotees he offered hope. By drinking his blood and eating his flesh (by proxy, from a slain bull) they too could conquer death. On a Day of Judgement those already dead would be raised back to life.
All this may surprise modern Christians but it was very familiar to the Church Fathers [See e.g. Justin, Origen, Tertullian], who filled their ‘Apologies’ with dubious rationales as to how Mithraism had anticipated the whole nine yards of Christianity centuries before the supposed arrival of Jesus – ‘diabolic mimicry by a prescient Satan’ being the standard explanation. Pagan critics were not slow to point to the truth: Christianity had simply copied the popular motifs of a competitive faith.