I should say that when I use the phrase “convicted of the truth,” in reference to the faith of an artist who is portraying a Christian subject (or employing a Christian lens in the portrayal of any given subject), I do not mean that doubt has no place in the heart of that artist, nor that such a person accepts as literal those aspects of the faith that depend on a conception of metaphor to be rightly understood. On the contrary, a person of faith (be they an artist or no) does not increase in faith without first struggling with doubt, and without also engaging their reason as far as that reason can be extended, at all times. As for doubt, it does not necessarily go away over time. I am not certain it ever goes away entirely for anyone.