What that research actually found

Across three samples, how religious you are strongly predicted how addicted you believed yourself to be, holding other things constant, while among people who did use it religiosity predicted little about how much. What you believe about yourself and what you actually do are two different measurements.

Across three samples, how religious a person was strongly predicted how addicted they believed themselves to be, with other factors held constant. But among people who did use pornography, how religious they were was unrelated to how much they used. Believing yourself to be severely addicted and actually using a great deal are two different things, and this study is where they were shown to come apart.

Grubbs JB, Exline JJ, Pargament KI, Hook JN, Carlisle RD (2015). Transgression as Addiction: Religiosity and Moral Disapproval as Predictors of Perceived Addiction to Pornography. Archives of Sexual Behavior, 44(1), 125 to 136 doi

A review of problems arising specifically from doing what you believe is wrong. The distress is real and not imaginary, and it is a different quantity from the behaviour itself, which is why working on the shame is not avoiding the issue.

A review and model of problems that arise specifically from doing something you believe is wrong. The distress it produces is real and it is not imaginary, and it is a different quantity from the behaviour itself. Either one can be high while the other is low, which is why treating the distress as a measurement of the behaviour misleads people in both directions.

Grubbs JB, Perry SL, Wilt JA, Reid RC (2019). Pornography Problems Due to Moral Incongruence: An Integrative Model with a Systematic Review and Meta-Analysis. Archives of Sexual Behavior, 48(2), 397 to 415 doi