Step-by-step explanation:
1. The wrong, defective and biased social upbringing that families adopt in raising their children from the early stages of social upbringing and moral education.
2. The political and economic interests that the sect takes into account when it struggles and fights with other sects.
3. Ignorance, narrow-mindedness, prejudice, and intolerance that dominate the rival religious and sectarian sects.
4. The material and immaterial interests that each of the biased sects reap in order to serve their purposes, intentions, and plans.
5. In some cases, sectarianism is due to the factor of foreign interference in sectarian affairs, which is biased in order to weaken society and trigger a civil war between its members and groups (we have referred to this in detail).
6. Sectarianism is due to the system of social and psychological diseases that prejudiced sects suffer from and that leads them to collide with each other, which weakens that society and leads to its collapse, the collapse of its structure and the rupture of its social fabric.
7. One of the most important causes of sectarianism is the presence of national and ethnic minorities, which lead to the bias of each sect towards its members and its stand against other sects without a right and just viewpoint.