I think I would agree that abstinence is better for Christians than contraception. But would you say it’s a mortal sin like RCC does that puts your soul in jeopardy? I wouldn’t. I can think of a million reasons to use artificial contraception. You get cancer and don’t want to get pregnant while you’re being blasted with chemo, or you have some sort of other illness that will lead to a very high risk pregnancy. You’ve tried your hardest with NFP and end up with 5 kids because your wife has a very irregular cycle and can’t afford having one more. You live in the middle of a war torn country where everyone is starving. In short, it’s more about the situation you’re in and the reason why you use it. So it’s not an evil sin if you’re using it for a legitimate reason.