The only negative impact Christians make on me is when they tell me they are going to pray for me, full well knowing I'm not religious. Prayer isn't going to work, but physically assisting me with a problem, will. It's as if prayer is helping the person doing the praying, feel better about themselves, like making them think they actually did something. There's no excuse for that. If a person can't help, say so. But don't goad yourself into thinking that praying for me works, because in my 45 Years on this earth, not once has that ever worked for me.
Disclaimer: I am only responsible for what I say, not what you choose to understand.