What was worship and law like before the flood?
Before the flood, there was no law and order and no prescribed system of worship. People did not kill animals for food; they ate everything that grew naturally. This differed from the post-flood economy, when God set things up differently.
Les teaches that as human history unfolded, God repeatedly changed the format even though He Himself never changed. Before the flood there was no law and order and no system of worship prescribed, and mankind could not eat meat. They did not kill anything to eat, but ate everything that grew naturally. After Noah and his family came off the ark, God's whole economy for man was set up differently, and He told them they could now kill and eat.