I find your second sentence ironic. You're being intellectually dishonest with yourself in saying this. I'd be surprised if there's a worldview that DOESN'T claim to be the honest one, except postmodernism, that would claim both about itself. I certainly wouldn't be caught claiming that Christianity is the honest one in front of a bunch of people who disagree. That would indeed not improve a discussion.
It apparently takes intellectual honesty to be any worldview.