That is… Without God and a firm foundation for truth claims.

I have just recently encountered this truth claim from an avowed naturalistic atheist.

empiricism defines everything that is objective and everything that we can physically experience.

At face value, this person is making an objective statement. However, the conclusion of the matter addressed in the statement is telling us that objectivity is outside of science. It can be proven this way: The above statement is expected to be taken as objective, therefore it is imperative to have empiricism to define the statement because allegedly empiricism defines everything objective. Yet there is not any empiricism provided or available that defines that statement.

Such a truth claim fails because of the circularity.

As to empiricism defining everything… Where is the empiricism that defines love? Where is the empiricism that defines anger or even altruism?

I do not think there is even any empiricism that demonstrates the purpose of such things, let alone being able to define them scientifically.

I do feel a bit of pity for such an irrational and untenable view of reality. It cannot be sustained without borrowing the objectivity from God, in the same breath they use to mock Him. Such an idea belies that no critical thinking has been applied to what they believe is real is really real.

God says it this way:

Claiming to be wise, they became fools.

Romans 1:22 — Modern English Version (Thinline Edition.; Lake Mary, FL: Passio, 2014)

Wouldn’t we think it unreasonable to operate with such delusion and tell others it is real?