So, when I approach others, I take it with caution... never know if they're not even interested or want to know any thing about God having a strong opinion which I respect and leave it at that. I don't tell them that they're going to Hell because it is not MY place to say it, it is GOD's place to say it. Whether people believe in God or not, its up to the people because they're given the choice to believe and follow God or not.
I'm the same with you, I never tell people that they will go to hell for the sins that they committed, because it's not my place to even say because for one, I do not know their hearts, nor do I know their mind. Only God does, God is the only one that can judged upon the individual.