Some advice that was given to me was, "If he likes looking at a naked woman, why not give him something to look at?", which actually did help to improve both my self esteem, and our sex life.
There is so much wromg with this, I do't know where to start.
Women made to be sex objects. "Something" ; yes, thing is the right word.
Women made to (try to) compete and pull their husband away from porn, which he knows well and good he shouldn't be watching for a no. of reasons.
The fact that he already has "something" to look at, but chooses to watch porn and is actually not providing op with the sex life *& intimacy she'd prefer.
Them behind all this is the controlling, victim blame'y, restriticve, repressive, misogynistic rules op has to follow.
Your post suggest it's up to op to solve this/partly solve this ...... no it is not.
It is up to op's husband to solve this ... by engaging with his religious mentor/leader, admitting to it, discussing, making plans for how he'll never watch it again, and stick to that, asking for forgiveness etc. That's his religion ... the one op sticks to, the one op converted to for him.
It is his fault, his failure, his "sin" so he should solve it. Op is a victim, it's not her responsibilty.