He was such a genius that he changed a lot of water into wine, with no known catalysts, on improvisation, and without any prior record of miracles.
And he was such a genius that he walked on water, calmed a stormy sea and healed the blind. Not to mention resurrecting people.

That's quite some genius. I'd love to know more about THAT stuff.

So the question really comes down to how much of the gospels and Acts, etc can be known to be 100% true. And if true, what it means.
If it's all true, it would have taken more than a genius to raise the dead in those days. There's more to it.
If it's not, then Jesus could have just been a public relations troublemaker for the Jews.

Personally I find it hard to believe that all the juicy bits in the gospels are rubbish - I believe he did perform miracles.
The source of his powers may not have been God, as he believed them to be. Or perhaps they were?
How can we possibly know?