Then I can assume you can't prove that atheism leads to selfishness and evilness?
Good and evil, joy and sorrow, happiness and pain, these things make life interesting, meaningful, fun - although on some days I may suffer (I have a bad knee, clinical depression, and some other things), it is because I suffer from a day of pain that I can deeply appreciate a day without pain. Because of all the weird, odd, and fascinating things people do, it is great to be alive. If I could stay here, to embrace life, the good and the bad, to learn, to love, to laugh, to struggle, to hate, to cry...why would I ever want to leave? Why not embrace all that life has to offer, rather than shunning half of it?