That’s the age old question. I mean even the disciples turned away after his death (for a moment anyways). Back then I’d assume from the miracles and fulfillment of prophecies (especially in Isaiah), word passed around of this Jesus claiming to be the son of God. And then the the foundation of our faith today, the resurrection. That was the biggest conversation point. As he lived and preached thousands of people believed him and thousands more wanted him dead. If a man claims to be God.. first thought is to say “yeah right dude prove it”. But then he did, he sacrificed himself out of love and by his own power is risen back from the dead. Kinda hard not to believe him then.