Hatebreeder
Pizzicato Heartstrings
So you feel it is ok to believe in something without sufficient evidence.
This is the basis on which Christianity is formed, and using this as an argument is pretty ineffective in dealing with Christians. In my experience, the best way to show the inherent flaws in Christianity is to expose the contradictions in the Bible and reveal to them the truth about a lot of Jewish traditions that were misconstrued by Christianity.