None. Atheism is not a theory, but a lack of belief in gods.
emotionalism
imitationalism
atheistic intelligent design is the theory that everything has been designed, but the creator is not God or a supernatural entity. John Gribbin is an atheistic intelligent design proponent and he concludes human beings are infact the creators of the universe, he calls his theory the "designer multiverse theory" it is a type of atheistic intelligent design. Other atheistic intelligent design proponents include some Buddhists and idealist philosophers who conclude every object in the universe is created from the mind of humans but objects do not exist when nobody is looking at them, what keeps them in existence is experience, Ernst Mach was an atheist who supported this, he called his theory phenomenalism the theory concludes there are no mind independent objects, only sensations are real.
That is constructionist theory.
The Evolutionary Theory
In "The Big Bang Theory," Penny's "big moment" occurs in the episode titled "The Space Probe Disintegration," where she expresses her feelings for Leonard. She tells him, "I love you," which is a pivotal moment in their relationship, marking a significant turning point in the series. This heartfelt declaration showcases her vulnerability and deep emotions, solidifying their connection.
A mathematical rule can be called many things including a theory. Proofs can prove this theory to be a rule.
Finny's theory about the war is that it is fake.
Emotivism is a metaethical theory that states moral judgments are expressions of emotions or attitudes, rather than objective truths. In other words, when someone makes a moral statement, they are not expressing a fact about the world, but rather their own feelings or beliefs about a particular issue.
Adlerian Theory
a new and different society will emerge from the blending of cultures