He’s only “stuck” on 6,000 years because you provided the example, from the teaching of your learned Marist Brother William, Vaquero.
You appear to have been thinking that you were somehow refuting a literal reading of Genesis by providing it.
My Homeroom teach...'Brother Christopher'(no nicknames...NEVER), had been a gold glove boxing champion and beat the living crud outta me at least once for mocking another brother who we called Mr Machine after his exaggerated stiff gait. as part of his religion class to us he cleverly showed a picture of how colony creatures possibly evolved into a fish looking creature and once he had the chalk simple fish on the blackboard...he went into the whole symbolism of the fish as the sign of Christ.... he used that analogy to show that God works in mysterious ways to make creation happen and except for the gospels, which are the transcription of the word of Jesus, hence God's own words, that the early, Jewish bible was in many ways (definitely not all by any means) just stories that firmed up our Judeo Christian morality and examples of how to live and why we must have faith in God....but we also must use the brain God gave us to improve human knowlege as that was Gods wish....