Have you ever read Jeremiah Joseph Callahan's book, Euclid or Einstein: A Proof of the Parallel Theory and a Critique of Metageometry? He proves Euclid's 5th postulate and disproves non-Euclidean geometries. Now a recent author has done the same in a more up-to-date way. He is Antonio Leon. He wrote "New Elements of Euclidean Geometry" and "Apparent Relativity." Now freely available at academia.edu.(Be sure to use his updated 2023 versions). This is a really serious science of lasting value. The non-Euclidean geometries take as an excuse the supposed inability to prove the 5th postulate to embark on their wildly improbable and totally unproven nonsense.