Wrong. No such widely accepted theory was ever proposed, and for good reason.

Science is a methodical system based on observations made in controlled experiments, testing falsifiable hypotheses. A divinity that created the universe or a theoretical "multiverse" would effectively exist outside it, at least beyond current scientific abilities to observe this. It is therefore currently impossible for scientific observations to pass judgment on God's existence.

The whole reason science exists is because humans are not omniscient—and our relative scope of observed and demonstrated knowledge is extremely small.

The scientific method therefore has not proven atheism true—at this point, it is still ”agnostic" in nature, leaving individual scientists to regard God's existence as a matter of faith or denial.

"Agnosticism is of the essence of science, whether ancient or modern. It simply means that a man shall not say he knows or believes that which he has no scientific grounds for professing to know or believe ... Consequently Agnosticism puts aside not only the greater part of popular theology, but also the greater part of anti-theology."
- Oxford University Professor Alister McGrath, from his lecture "Has Science Eliminated God? Richard Dawkins and the Meaning of Life"