Ok so my friend at school doesn't like to be called "atheist" but he doesn't believe in any god he believes in science he says. So anyways, at school i always put a cross at the top of any paper i get, so he asks me, "Why do you put a plus sign on the top of every paper" I explained that it was a cross and he told me that God doesn't exist because WHERE DID HE COME FROM, so i told him He has no beginning no end, he told me SAME THING WITH THE ATOM no beginning no end, after that he changed the subject, but i wanted to know how could i answer this. i am in no position to defend my faith. I am 13 years old and i am not of the level of the Fathers of the Church
SO PLEASE TELL ME HOW I CAN ANSWER HIS QUESTION?