[anon1685]

Secular thinking can also become a folly, just like any religious thinking. For example, believing that anything and everything can be measured in numbers, or refusing to acknowledge any phenomenon which cannot be explained scientifically.

A rational mentality does lead to a more civilized society, but sometimes it can be just as cruel.

[vacri]

Rejection of catholicism doesn't mean you think everything can be reduced to mere numbers. Nor does secular thinking mean that you consider everything can be measured by numbers. I would say that most secular people don't believe this, given that most secular people are simply areligious rather than STEM fans.

[CamperBob2]

Secular thinking can also become a folly

No, it can't. If it's a "folly," then either it was not really secular, or it was not really thinking.

Secular thought can still be wrong or incomplete, but as far as the folly of the process itself goes, it is the only process that has advanced Mankind over the course of thousands of years. Anyone who criticizes it must be prepared to provide a better alternative. So far that hasn't happened.