In your opinion what causes christians to believe in Jesus

[Sheldon]

Faith (religious) is defined as a belief. 

...and they are beliefs based on faith in that doctrine...

I just want to highlight that the bottom quote is incoherent if the above definition is correct. A word substitution gives us the following phrase, And they are beliefs based on belief.  You can't use belief and faith in the same sentence to refer to different things while arguing they mean the same thing.

I was not referring to different things, as beliefs can be based on other beliefs, and the definition is in any dictionary, and you have ignored a whole swathe of objections to your claims. 

Faith
noun

1. complete trust or confidence in someone or something.
2. strong belief in the doctrines of a religion, based on spiritual conviction rather than proof.

So, if you are defining religious faith as 1, rather than 2, this is a false equivalence that requires explanation / justification. You might also address the other objections to your claims.