Let me say that I concur with most of what has been provided in the replies above. You are going to be fighting this with him as, given what you wrote, your concerns have made no difference. It will not change easily or readily. The religion excuse, BTW, fails in the presence of porn.
Silverado is right, RUN AWAY. Saying that this is not the relationship you want or envisioned is a perfectly valid reason to say ADIOS! And that is what you are saying. He may promise he'll change...but given what you've written, he won't. It will be upsetting to you, maybe to him, too (but maybe not for him, who knows). It's one thing to use porn to assist in triggering the desire (my ex used to read the "Letters" in Penthouse and would absolutely jump me after sitting there, usually on the bed, reading other's adventures, and gently playing with herself). Or to use it as a way of exciting oneself to discover how one's body reacts (and then to use what you learn to add to the quality of lovemaking).
It's something all-together different to use it as a substitute for the real thing with a real-live person willing to give themself to you (and you to them).
You deserve better than this.
Last sex: 04/06/1997 Last attempt: 11/11/1997 W Issues "No Means No" Declaration: 11/11/1997 W chooses to terminate sex 05/1998 I gained 60, then lost 85 pounds. Start running again (marathons)