We are a medical site, so I can address the medical aspects of your question. Your religious concerns should be addressed with your pastor.
An addiction is something you can't stop doing, and usually has negative consequences in your life. Masturbation, in and of itself, is not harmful. Most people do it.
Porn can be harmful if you are taking ideas from it into your real life - porn is fake, all lights and acting and faked orgasms. There are ethical issues with it for many as well, but that's a decision for you to make.
Medically, are you hurting yourself when you masturbate? Are you doing it to the point of chafing or raw skin? Ignoring your responsibilities? If there aren't negative consequences, it's not likely an addiction.
Your religious convictions are something else, but there are health benefits to masturbation so long as it isn't bringing negative consequences to your life. Many experts feel that regular ejaculation reduces the risk of prostate cancer. It's probably not enough of a reduction to go against religious beliefs, but I do have to inform you of that.
Talk to your pastor/priest/church leader about the religious aspect. If it's an addiction for you, they may know of a counselor you can talk to.