What does it mean that prejudice arises when thinking is confined by secularism?

"Secularism confines thinking, prejudice arises" is an expression that describes a social phenomenon. It means that people are prone to prejudice or discrimination when society's thinking is limited by traditional ideas, customs, culture or other constraints." Secular confined thinking" refers to the fact that under the constraints of traditional culture, social systems or values, people's thinking is limited to a fixed range, making it difficult for them to develop new ideas or accept different views." Prejudice is born" means that people are prone to prejudice due to the secular confinement of their thinking. Prejudice is a form of subjective bias and negative stereotyping of a group, culture, race, gender, and so on.