Rowan Williams, the former Archbishop of Canterbury gave an interesting answer to the somewhat stark question, what’s the point of us existing?
He said:
As a Christian, my starting point is that we exist because the most fundamental form of activity, energy, call it what you like, that is there, is love. That is, it’s a willingness that the other should be. The world exists because God desires that there be an other, and so love is fundamental to that.
If bringing others into existence is an expression of love, then it makes sense that God loves his “so much” (John 3.16) as the first one he called into existence. God was alone and completely sufficient in himself, and he did not need any other person in order to make himself complete, but it was an active choice, prompted by love, that moved him to create other beings to share existence with. If God had always existed as three persons, as Trinitarians claim, then it was no choice, or expression of love, to share existence, but an eternal fact. The Trinity therefore undermines the initial act of love by God in sharing existence, first with his firstborn son, and then with the angels and humans.
Rowan Williams’ comments are at 2.45 in this video