The god of the old testament was cruel, vindictive and required blood sacrifice.
That doesn't sound like Jesus to me at all.
That sounds just like Satan.
Besides why would Jesus need to come if was already here and the same?
you are under extreme prelest to call the Christ, who is the God of the old testament Moses met face to face, "Satan".
Christ incarnated to ontologically unite humanity to the Father, to trample on death, to establish his Church which spreads His Gospel and ultimately to invite us back into the Divine Life humanity willfully rejected in Adam. He gave His apostles the power to bind and to loose, to feed His sheep the divine mysteries of the sacraments and more that I could ever write.
this is the issue when someone thinks they can learn theology through their own comprehension of holy tradition, you start reinventing heresies that are 1800 years old the Church squashed triumphantly.