So let me explain to you why this is offensive:
It's arrogant. It's saying: "You are a poor fool who's wasting his life, and I am above you. I'll extend my hand and save you, you little sinning worm."
I know you think you're saving them from eternal torment, but you need to realize in their reality this is not the case. Imagine for a second, what if God didn't exist? Then your praying for them would do absolutely nothing. But the insult would remain. The idea that you're superior to them and all.
Another thing that's offensive about it is that you're indirectly actually saying, that you think they deserve to be tortured for all eternity just for what they believe. Don't dodge it by saying that's god's will. You're kissing up to that god, you think everything he says is right. And if that isn't offensive, I don't know what is. Just think about it! Torture, eternal torture, for believing the wrong thing! That's beyond insane. But I already have a thread about hell here. (check out my first post, and my last one that's a bit long, if you don't wanna read the whole thing)
