You say that only Jesus can do the Will of the Father, yet throughout the Gospels Jesus exhorts us to to the Father's Will. So your logic can't be correct. Jesus told us that those who do the Father's Will are His family, that only those who do the Will of the Father will be saved, and Jesus taught us in the Lord's Prayer to pray that we do the Father's Will.
Rightly divide the word of truth...those same people had no understanding of the cross. They had no clue of the death, burial, and resurrection that you and I know today after the cross.