The distinction I make in the meaning of ideology and culture is rather simple but serves me well. Ideology is an intellectual activity. Culture is a physical activity.
Intellectual activity produces worldly artifacts, the objects people make real, or culture. These artifacts are behavioral (subjective, intangible) and tangible things such as spoken and written language(s), music, architecture, costume, tools.

Diversity is the key to economic and political evolution.

That is, it's a largely conscious (in the sense that its tenets can be brought to self awareness) fudge between an unconscious map of how the world ought to be and the undeniable aspects of reality.

They usually have a culpable "other", have you noticed?  Whether it's single mothers, asylum seekers or neolibs...