I'm sorry you're not addressing the fact that Mithraism had all that wonderful stuff that Jesus supposedly did up to two centuries before the latter made the scene.
Actually Mithraism in its ultimate form did not really appear in the Roman empire until about 60 years before the birth of Christ. I also don't believe you can use Mithraism as an excuse not to believe in Christ in fact I think that it is evidence to the contrary. I believe fully that Mithraism and it's moral philosphy that stated all men are equal, that men must defend the weak from the strong, That civilization must be defended from savagery, and that Good must battle evil is evidence that God speaks to all men.
The articles referenced in my post do address the supposed historical facts you claim regarding Mithraism.
You can start with this one: Mighty Mithraic Madness