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An apple is a single unit though.

An apple is made up of constituent parts, but it is a singular thing.

If you argue against an Apple being singular then you are essentially professing that nothing is singular.

When you take a bite out of an apple you now have a subset of an apple “an apple with a bite out of it”.

To me saying God made the integers is more akin to saying, there is and there isn’t, and all else is built upon the difference.

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An apple is an abstraction. It's a combination of chemicals bonded together. Those chemicals are composed of atoms which are bonded together, each of which are composed of electrons, protons, and neutrons. Those particles are composed of quarks, and so on.

An apple is a singular thing because it is useful for us to think of an apple as a singular thing in most contexts. It is not a singular thing when it is more useful to look deeper.

Then take quarks. They are a fundamental particle with no known substructure. They are a single unit and they are countable.

Sure, but metaphysically, I’m positing that the whole concept of a unit or particle is a human thing.

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