Though, ironically, it's not really Jesus most people have a problem with. Face it, whether you believe Jesus was real or not, God or not, he seems by all accounts to have been a pretty decent fellow who died a horrible torture death basically for wanting people to be kind to each other and help each other out.
Who folks have a problem with is the modern day Pharisees and Sadducees committing the same oppression, spiritual abuse, and atrocities as their historical counterparts in his name.
That shit is NOT COOL.