My argument is that so far, there's absolutely no evidence, and consequently no need of a supernatural being such as God in the Universe. Many people claim that they have seen or heard God, or felt his presence. I've personally never felt a "sign" or some such thing in my life, so I can't believe these claims.
That being said, I can see how religion and the idea of God might seem attractive to some. I've seen my own mother turn to religion after the death of her parents. At first, she was seeking closure and solace, but now she can't function without religion. For any kind of advice, she turns to her religious texts. She is ready to believe anything they tell her. I've seen this happen to many of her religious friends and some of my relatives. This is why I especially dislike religion - it tells you fairy tales that distance you from reality. I think it stops people from fully living their life, without guilt, without fear of judgment.
So I think that from the information we have at present, atheism is the only rational choice. History shows that time and again, religion has done more harm than good. I don't think we can afford to overlook that now and pander to religion just so we won't offend some people. Not when we have science to explain or at least attempt to explain all the things religion never could.
