To which an atheist would say, 'from my POV all gods are the same you can't prove any of them exist or not.' This is playing the devil's advocate. Faith is something you have, it is a gift of the Holy Ghost, and if people had definite " "Proof of God" there would be no need of faith. These arguments do not deter me and they should not upset you. People can be preached to, they can be led, but conversion is from the Holy Ghost and you can't control Him.