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Congratulations. As far as I know, Descartes was not the first one to argue "I think, therefore I am", nor will he be the last. The sentence belongs to the public domain.
The interesting bit is that if you understood Descartes, you wouldn't disbelief and I wouldn't renounce of him. 'To be' in the context of cogito ergo sum is to be res cogitans, which is not necessarily to be res extensa, as the argument of res cogitans comes before realization of res extensa.
I didn't speak Descartes theory according to you (and I agree): "The statement does NOT say 'I think because I am.' [...] Rewording Decartes, 'I weightlift, therefore I am strong.'[...]". Why would you suggest now that I do? And why would you suggest I don't believe rocks exist? Because, summing up, and I quote you, you're an ass.
"Rocks exist." Weren't you the one who wanted to follow Descartes? (I didn't mention him.) What kind of argument are you using to say such a thing? "Rocks exist." Not the kind of sentence Descartes would use at the start of a paragraph. If he had been as methodological as you are here, he wouldn't be remembered.