Q. I read your posts last week seeking to prove the existence of God from the meaning we find in life and the universe. But, even if God exists, I don't see why he would care about us, especially about whether we "sin". Why would God, who created a vast universe full of galaxies and stars, care whether I lied or masturbated, or stole something?!? Ridiculous! If he doesn't care about us, wouldn't that mean our lives still have no meaning?
You're making a basic metaphysical misstep, confusing quantity with
quality. Just because something is more numerous or larger doesn't mean
it is more valuable. Would you rather have all the sand in the Sahara
Desert or a single priceless diamond? Just because the universe is big
doesn't mean some (comparatively) small part of the whole isn't of the most value to
God. It's not enough to just point to the size of the universe and say, "well God must not care a fig about us, we're just floating around on some small, insignificant speck in this vast universe." It's not like God can lose track of us because space is so expansive.
Let's go back to the Sahara Desert analogy. Even that priceless diamond would be cast aside as a piece of junk if you had to choose between carrying it out or carrying your infant child out to safety. Why? The baby is just a "small speck" in the vastness of the desert. We could increase the size of the Sahara to cover the entire Earth, or indeed the entire universe and it wouldn't make the sand (or even the diamond) worth anything compared to the life of a loved one. To make the analogy sharper, we should change the naturally forming desert into a vast sandbox which we've created for the child to play in. No matter how big the sandbox gets, because we made it for the kid to enjoy, it can never, in principal, be worth more than the child for whom it exists. In much the same way, God loves His children, you and me, more than all the stars, comets, and planets that fill our universe (our sandbox). And just like a good parent who hates what is bad for his child, so too God hates what is bad (indeed eternally lethal) to His children - sin.