The natural reaction to Christ is to reject him. He said so. In fact, when he was taken to the Temple as an infant, St. Simeon prophesied that he would be a center of contention. Later he predicted his own death and told his followers they must expect persecution too.
His bitterest enemies weren’t atheists; they were the most religious men of his age, the Pharisees, who considered his claims blasphemous — as, by their lights, they were.
Nice? That’s hardly the word for Jesus. He performed miracles of love and mercy, but he also warned of eternal damnation, attacked and insulted the Pharisees, and could rebuke even people who adored him in words that can only make us cringe.
To many, he was a threat. He still is. We honor him more by acknowledging his explosive presence than by making him a mere symbol of nice manners. At every step of his ministry, he made enemies and brought his crucifixion closer. People weren’t crucified for being nice.