Why can’t we serve God our own way? Why do we need to follow rigid rules?
Serving God our own way would be good if God didn’t need to be served.
If God doesn’t need anything than we can serve God by giving him whatever we want.
But if God does want something, then we serve him by giving him what he wants.
If God wants something from us, and we give him what we want to give, then we aren’t serving him.