Family, friends, society/police?
Conscience?
What binds us to family? Friends?
Do you see animal life forming lifelong bonds with their cousins and siblings? No.
Without an intangible feeling of connectivity between beings a family is just genetically similar beings from the same lineage. Nothing spiritual or special about that.
If there is no creator, and we are all on this planet by accident, love is not real. Love was not created from a Big Bang. It must be a placebo feeling, making people want to breed and nothing more.
The idea of a creator is very simple to me, much more simple to grasp than grand coincidence and nothing else.