what kind of distinction is “traditional” vs. “secular” anyway?

It's a complete asspull. the tradition <-> secular axis is supposed to measure influence of religion on values, but the questionaire they tried to measure these values with focusses mostly on issues that are controversial in christianity, and to a lesser extend islam and judaism - divorce, suicide, abortion. but not LGBT rights, that's part of the survival <-> self expression axis, because you can only gay when your basic needs like food and shelter are already met, otherwise you don't gay. That may sound confusing now, but it makes even less sense when you read up on it.

This is ofc incredibly dumb and produces completely useless results, so they covered that up by just painting these colorful amorphous blobs for different cultures over their graph. The blobs are amorphous so the colors only have to align remotely with the actual placement on the graph. It's bullshit all the way down.