Can reason be an idol? Certainly. The philosophy of rationalism puts human reason in the place of God as the source and standard of all truth.

The loss of objectivity in moral thought does not lead to liberation. It leads to oppression. Secular ideologies preach liberty, but they practice tyranny.

A worldview is not the same things a formal philosophy, otherwise it would only be for philosophers. Even ordinary people have a set of convictions about how reality functions and how they should live. Some convictions are conscious while others are unconscious but together they form a consistent picture of reality.

Clearly, Enlightenment thinkers were seeking a God substitute.

The defense of marriage is the defense of freedom. Neither of which is obsolete.

Because a human is a someone and not a something, the source of human life must also be a Someone - not the blind, automatic forces of nature, as philosophies like naturalism and materialism tell us.

Can reason be an idol? Certainly. The philosophy of rationalism puts human reason in the place of God as the source and standard of all truth.