At OP-
There are so many things wrong with religion, you can't pin point it to one thing. Once you get past the immoral parts there is a whole scientific aspect to it. That's when religion really falls flat on it's face. Yeah you argue how it's genocidal, petty and pointless but world created in a few days? Flat planet? People lived for hundreds of years? Ok....
I know it's good to debate but believe me you will never convince someone who believes in God that he/she doesn't exist and it's all a load of BS for such and such reason. That can only come from themselves through their own life experiences and research. Only a theist can start questioning their own faith and those with an open mind and a thirst for knowledge will come round eventually.