Religions have caused wars to rage on from nations to nations. Also Socrates was killed because of the harsh religious laws gave out. Not only that, there have been a few battles for religion. The Crusades is one such example. Gods may give us confidence but religion actually destroys us.
Religion has been responsible for an unbelievable amount of deaths over the years. It has aloso caused pain and suffering for many millions of people. Many children grow up around strong and extreamist views which can damage them mentally and physically. There is also huge oppression against women in a world where equality is encouraged!
Everyone has their own opinion - nobody is "wrong", people should respect that, as long as there is peace it doesn't matter if you are religious or not, people saying stuff like that will cause tensions and that's how wars start. If people want to be religious, let them get on with it.
The fact that the bible for example has been so accurate about the things that it recorded in the past and it is so in sync with science in many ways that it would be hard to back up a reasonable argument against it and maybe because there is a true religion out there somewhere.