What are the dangers of intellectual attacks such as religious liberalism and secularism on Muslims?

Summary

This Bayan Linnas explains that intellectual attack (al-ghazwu al-fikri) is a non-physical assault aimed at the minds and beliefs of Muslims, with religious liberalism seen as its most prominent and dangerous form. It spreads through three main isms, namely secularism, humanism and religious pluralism, and is assessed from the Ahli Sunnah Wal-Jamaah perspective. Secularism is described as an outlook that separates worldly affairs from religion, accepts religion only as a private practice and rejects sharia and creed as the basis of life.

Written in our own words from the original fatwa — check the source before acting on it.