Pistolpete
I also don’t think that the Intelligent Beings responsible for life on earth were the same ones who created the Earth. Most people who believe that the same one who created earth is the same one who created life on earth. This is the result of believing in the God of the Bible who is said to have created all things, so it their default position the ONE Being created all.
It’s very difficult for people with this belief to consider other possibilities.
In considering multiple possibilities people often look for the right balance between the simplicity of the possibility and its explanatory power. The simplest theory with the greatest explanatory power tends to be a good option to lean towards. Postulating one intelligent being is simpler than multiple intelligent beings. If it’s possible for an intelligent being to exist with sufficient power and knowledge to create the universe and the earth, then this being also most likely has the knowledge to create life. This doesn’t disprove your theory; it just indicates your theory has more moving parts than needed to explain the existence of the universe, the earth and life.