Jesus said to them, “Truly, truly, I say to you, before Abraham was, I am.”
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If someone claims that (who is not God), it is blasphemy. That is a serious sin... unless that person actually IS God. One of my favorite passages is John 8:58, because of how eloquently Jesus made the claim, and because the reaction clearly demonstrates that they clearly knew what he meant. And they killed him for it..
In the beginning... both Genesis and John's gospel tell us that God created the world. But John's gospel presents Jesus as the Creator. This is not a case of "either/or," but "both/and."
- Who raised Jesus from the dead? You'll find that the Bible will tell you that God did, but you will also find that Jesus said that he would raise himself. Again: both/and.
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I'm sure a person can be saved without first knowing how to defend the doctrine of the Trinity (like the thief on the cross next to Jesus), but can a person truly be saved who vehemently denies it? I honestly doubt it. This is not a matter that has to do with allowable preferences, but a non-negotiable, essential doctrine. It is heresy to deny the deity of Christ. I wished that I could answer the man's question. Hopefully someone will.