The old testament is essentially Judaism which is an ethnic religion. There is no marketing needed because it is a religion for a specific group of people from a theoretical single lineage. There is no need for God to be accepting or patient since the goal appears to be unify and keep people under control during times of great strife.

Christianity is a universal religion ie. it tries to create new followers. If you’re a religion that is trying to spread grow your following, you need to have a message of openness and acceptance.