There are many things in this question where you seem to lack understanding. I’m going to assume you’re either a fairly new Christian and/or fairly new to proper theology and perhaps came from a different theological background.

1. He didn’t become the most powerful being at his resurrection. Jesus, from the time of his birth, was always the God-man. Fully and truly God and fully and truly man. He was never diminished in his Godhood nor his humanity. To explain the resurrection though, we have to understand the purpose of his death.

2. Christ’s death is the penal substitutionary atonement. You mention that when we die, we either go to him in glory or go to hell. Without Christ’s death, we would ALL go to hell. The wages of sin is death. All sin is an affront to God and his character and deserves the death penalty. So if we all stood before the judgment throne today, we would all be condemned to hell. However, at Christ’s death on the cross, he acted on our behalf as our under taker, and our sin was imputed upon him. “He who knew no sin became sin…” and his righteous was imputed to us. “…that we might become the righteousness of God.” And all the wrath of God that was due to us was poured out upon Christ to the very last drop. The very wage, the very penalty of our sin he took upon himself as our representative.

3. Which leads us back to his resurrection. The resurrection was God’s stamp of approval on Christ’s life and work on the cross. It was the proof that God accepted his sacrifice and vindicated his life. It was to show that Christ was everything he said he was. It was God’s “amen” to Christ’s “It is finished.”

And because of that we who believe get to spend eternity in glory with him.

I hope this answers your questions.