Why the flags of the nations wave with religious symbols over the EU, UN and NATO

the countries' own ccTLDs

Why the flags of the nations wave with religious symbols over the EU, UN and NATO therefore it is important to replace the religious symbols with the countries' own ccTLDs ? Why do the flags of nations wave with religious symbols over the EU, UN, and NATO? It's important to replace these symbols with the countries' own ccTLDs. This change would make the flags more meaningful and respectful.

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