If she stopped you from doing that, then it sounds like you definitely made the right call in who to trust. You never want to make deals with Lucifer or any demons. If it even sounds like a deal, even if they call it something else, don't agree to anything. Nine times out of ten, they twist whatever wish you're making, and even when they deal straight with you, the payment is always your soul. Not a thing you want to give away, especially to anything that comes from Hell.
You too. If you ever have other questions about the theology stuff, give me a shout. Might as well get some use out of the four years of seminary school.