What that research actually found
Read the second finding carefully. It is the one that will be a relief to somebody who has concluded from the sheer size of their distress that they must be in the worst category there is.
What the research says
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
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, 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
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.