Why should I say either?
Because you made the claim, and an argument has been put forward which purports (accurately, in my estimation) to show that your claim is unjustified.
My belief rests on the evidence of the New Testament, and the contemporary corroboration of it.
Your broader belief in Jesus and God isn't the issue in this particular discussion, but rather what you think is the validation of the reliability of your source.
I have a faith, which you will certainly dismiss, but that merely means you cannot think outside the box, and do not appreciate others may do so.
Faith is, largely, meaningless in a quest for any sort of reason to accept a position. It's important to people in their daily lives, and therefore not without significance, but useless as a research tool.
That isn't a failure to think outside the box, it's a capacity to select appropriate tools for a task. You can think outside of the box all you like, which has its uses, but none of those uses are finding out about what's actually in the box.
O.