The bottom line is that people aren’t upset that Christians allege that Jesus is the only way, but rather that Jesus is a way at all. They don’t like the Jesus-way, which requires repentance. It’s all about choosing the pleasures of this world over God. So people try to offer God something else instead, just like what Cain tried. Rich men will do whatever pleases them, and then will engage in some form of philanthropy, in order to present some form of goodness in exchange, but which is really no different than what Cain had unsuccessfully tried. So that works its way back to the complaint that Christianity is arrogant for presenting a belief-system that suggests that Jesus is the only way. They don’t want Jesus’ way. I’ve never understood why people should complain that Jesus is the only way, instead of giving thanks to God that there is a way provided at all, until you realize that that’s not the heart of their issue.