I don't know anythign about any "volcano god"
... but yes, the god in the OT is jeleous, wrathful, full of revenge, hates his enemies ... I really could go on and on. Jesus contradicted Yahweh too many times for Yahweh to be Jesus' Father.
So while I've never heard of a "volcano god" theory (sure is an interesting thought) - I am however, thoroughly convinced, that our Father in heaven, is NOT Yahweh (and therefore, Jesus is obviously not Yahweh ... BTW, Jesus prayed constantly - if Jesus IS God, was he praying to himself?).
Christians need to ask themselves one simple question: Would Jesus order his followers to commit
genocide? (hint:
NO!)