SECTARIANISM IS SIN. What does sectarianism means?

If you follow my facebook pages you know that the topic or August is SIN. So in my study I came across this topic in 1 Corinthians 1:10-17; Sectarianism is Sin. Also read 1 Corinthians 3:1-17 titled; Sectarianism is Carnal. So I AI searched it and this is what it said as posted in Google.
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AI Overview: In the Bible, sectarianism refers to the division and conflict within the Christian community based on differing interpretations of doctrine or practices, often leading to the formation of separate groups or factions. The Bible, particularly the New Testament, emphasizes unity among believers and warns against the dangers of sectarianism, which can undermine the church’s mission and witness. Here’s a more detailed explanation:
1. Biblical Context:
- New Testament Emphasis on Unity: The Bible, especially the New Testament, stresses the importance of unity within the Christian community (e.g., John 17:20-23, Ephesians 4:1-6).
- Warnings Against Divisions: Apostle Paul, in particular, strongly condemns divisions and factions within the church (e.g., 1 Corinthians 1:10-13, Galatians 5:19-21).
- Examples of Sectarianism: The New Testament also mentions instances of sectarianism, such as the division between the circumcised and uncircumcised in the early church (e.g., Galatians 2:11-14).
- “Hairesis”: The Greek word hairesis, often translated as “division” or “sect,” is used in the New Testament to describe these factions (e.g., Galatians 5:20, Acts 24:5).
2. Defining Sectarianism:
- Division Based on Doctrine or Practice: Sectarianism involves separating from other Christians based on specific interpretations of Scripture or particular practices, even when those differences don’t negate core Christian beliefs.
- Prioritizing Group Identity: It often involves prioritizing loyalty to a specific group (denomination, sect, etc.) over the broader unity of the Christian faith.
- Potential for Pride and Exclusivity: Sectarianism can lead to a sense of superiority and exclusivity, where one group believes they alone hold the truth.
3. Dangers of Sectarianism:
- Undermines Unity: It disrupts the unity and harmony that should characterize the Christian community.
- Hinders Spiritual Growth: It can hinder the spiritual growth of individuals by limiting their exposure to different perspectives and potentially fostering judgmental attitudes.
- Weakens Witness: Sectarianism can weaken the Christian witness to the world by presenting a divided front.
4. Healthy Variation vs. Sectarianism:
- Biblical Diversity: While the Bible encourages unity, it also acknowledges and allows for diversity in non-essential areas of belief and practice.
- Focus on Core Doctrines: Healthy diversity is distinct from sectarianism, which elevates minor differences to the level of core doctrines and creates division.
- True Unity: True unity in the Christian faith is not uniformity in all areas but a shared commitment to core doctrines like the divinity of Christ, His resurrection, and the authority of Scripture.
In essence, the Bible calls Christians to strive for unity while avoiding the pitfalls of sectarianism, which can be detrimental to both the individual and the collective body of believers.