Idolatry - the worship of someone or something other than Yahuwah as though it were God. The first of the biblical Ten Commandments prohibits idolatry: "You shall have no other gods before me." We are committing idolatry if we worship anyone but the true God of the bible.
Many Trinitarians believe that Yahushua’s prayer in the Gospel of John 17:5 shows that he pre-existed. But is this really what he was saying?