There is a group of Muslims (mostly the majority) who do not care about their own religiosity with God as much as they care about the religiosity of others. You find them appointing themselves as deputies of the Lord of the Worlds, granting themselves the right to interfere in the actions, words, and lives of other human beings, criticizing them if they do not like what they see.
These "Enclosed Ones" (dwellers of the shell) have made their inherited ideas a constitution that everyone must comply with. However, if anyone dares to criticize their ideas, they resort to insults and accusations of heresy (Takfir).
This type of people considers themselves the center of the universe, believing they are the only ones who truly understand religion. To them, everyone else is ignorant, atheist, deluded, stupid, mercenary, or an enemy of the faith. They believe they alone possess the truth.
Their major problem is that they never develop the ideas they use to criticize their opponents; there is no modernity in their thought. They repeat the same ideas and the same words on every occasion.
During New Year's and Christmas celebrations, you'll find them repeating the same old record: "It is forbidden to celebrate the holidays of the infidels." They aren't content with just not celebrating themselves; they "beg" on the pages of others, intruding and criticizing them because they are celebrating or congratulating their friends and acquaintances. They occupy themselves with people rather than focusing on themselves, their only concern being to "spoil" the joy of others.
Once the occasion ends, they return to their shell, waiting for a new one—like praying for mercy for a non-Muslim, Mother's Day, or Valentine's Day—only to emerge again from the enclosure where their priesthood placed them, repeating the same lines: "It is forbidden to pray for mercy for non-Muslims; it is forbidden to celebrate."
The beauty of the matter is that these "intruders" are busy with other people's lives while the rest of the world pays them no attention. They don't give them any weight; they continue their lives with happiness and joy, living their enjoyable moments. Meanwhile, our "Enclosed" friends remain in a state of bitterness and boiling anger, failing to live their lives as they truly wanted, and failing to influence others by stealing their joy.
They have nothing left but to return to that shell, waiting for the next occasion.
And so it remains, back to square one.
Conclusion:
People of the shell live in a closed cycle of criticism and interference in others' affairs. Meanwhile, normal people continue their lives in peace and happiness without heeding these criticisms. The solution is to focus on self-development and respect others' privacy instead of wasting time criticizing them.