Typically, atheists attack Christians with “There is no God, and you are wrong.” This is not actually the atheist position. First, when we meet someone, we have no idea what they are calling god. It may very well be that their cat is god; in which case it exists, but we are not going to call it a god or worship it. But, we must agree it exists. So what if they say God is love? Does love exist? Yes, but we have a perfectly good word for love: “LOVE.” So why call it god? Our assertion that "God does not exist is fallacious. We do not have enough information to make that assertion. The universe is a big place and we have not yet turned over every rock on every planet or viewed every possibility.
So most atheists do go on the attack with their assertion, 'God does not exist." This tends to be especially true of new atheists. It is true because that is what they think atheism is. It is not.
Atheists experienced in their craft know when to make 'God Claims." They know when to assert a specific god does or does not exist and what facts to base their claim on. All claims need justification. What god are you talking about, and how do you know what you are claiming is true? What are the irrefutable facts?
Seasoned atheists are more likely to say things like, ‘I don’t believe in gods, magic, or the supernatural.’ I just have not seen any evidence for such claims. Or they may just say “I’m not religious.” This tends to invite inquiry and leads to a much more congenial form of communication. It also allows the religious person a quick exit without feeling offended by “Your god does not exist!” Which is about the same as asserting “You are an idiot for believing in God.” and that is equal to “You are an idiot, and going to hell, for not believing in a god.”
So, when you see the offended Christian, first take a look at how they approached you. If they approached you in an offensive manner, well fuck them. Who gives a shit if they are offended. Your fucking god is a mass murdering piece of shit who professes to be all powerful and yet stands around while babies die, and women are raped, people are born with deformities and idiots like you are allowed to wonder the streets.
On the other hand, if they approach you with politeness and a simple ‘God bless you.’ “Thank you for your kind gesture. I’m not religious, but I appreciate your sentiment.” is perfectly in order. If they get offended at that, they are an ass. They are the ones that started the religious shit with their “God bless you.” It is perfectly okay to mention that I am not religion in the face of someone boldly indicating that they are religious to my face. IMO And I have been very nice about it.
LOL - I can get nasty quick as shit? LOL… but I don’t go there often, and I have had some good discussions. (I’ve also been nasty once or twice.)