In your opinion what causes christians to believe in Jesus

[Angrboda]

It isn't shopping around. The word has two different senses. Can you not just state which sense you are talking about? 

My argument is that only one sense exists within Christianity—that of trust. The other senses are as irrelevant as it is to point out that bank also means the edge of a river when I'm trying to deposit money. These might as well be different words, so there's no reason to acknowledge them as having equal merit.

Bollocks. Blind faith has existed within Christianity since the beginning. That you don't want to acknowledge it is telling.