Ok.
Let's just forget medical science
Mayans hardly have access to medical science, they get access to their natural methods, because it's what they can afford.
the moon landing
Nobody that lives under those conditions gives a shit about the moon landing.
aeroplanes, submarines,
They won't even dream to get on one of those unless the go illegally to the U.S and get returned by La Migra.
the microchip
Yeah? They probably don't know what that is.
head back to our caves
They still have their rituals in caves.
Let's worship the sun,
They worship nature, they have combined their religion with christianity.
eat human hearts to gain their strength
Aztecs did that, meh, you have a point here.
sacrifice animals to our various dieties
They still kill animals they raise and herd. I'm not sure if they make a ritual out of it, but they probably do.
because that's far more progressive.
I'm yet to see the Spanish progress on those people. So far the progress was:
1. Adapt their beliefs to suit christianity.
2. End of human sacrifice which instead was replaced with genocide.