Religious overthought

I was at my friend's church Christmas and the preacher said that our purpose, (After a long dragging rant about Jesus) is to love God no matter what.  I was sitting quietly in the back shaking my head.  I feel that God would seem kind of selfish if the only point in our existence was to love him.  If you have to rely on the love of a higher being that may or may not exist, then you don't love yourself.  This is why I wholeheartedly believe that the point of life is to live.  Take a moment to ponder this fact.  God gave us the gift of life, and by living a good life, we are fulfilling the gift that He gave us.  My sister's friend told me that it would be the most hilarious thing in the world if all of the over evangelical Christians went to hell, and that all of the people that went on living went to heaven.  I found this hilarious as well.  But suppose that there is no heaven or hell, suppose that we just rot in the ground.  Suppose that all of the metal heads in the world would instead go to some Valhalla and live out an eternal existence drinking, partying, listening to metal, and doing all the women they ever liked.  Man, that would be great.