Church flies Christian flag above American flag

I'm curious now... what's the purpose of a Christian flag? Wikipedia says it was conceived of in 1897, and that it represents all of Christianity and Christendom. So, it's a pretty modern and non-denominational symbol of Christianity. And it's a container for other long-standing symbols... the Cross, waters of baptism, Christ's surrender.

It's obvious that the flag is not something referred to in the Bible. Even the symbols that the flag bears, while traditional, are not, I don't think, strictly Biblical in the sense that we have no direction from Scripture as far as elevating those concepts to be symbols. While I'm no expert on Vexillology, I understand that the highest placed flag is the most prominent/honored/etc. what I don't think I really understand is the purpose of the Christian flag, other than a reminder. Does elevating the Christian flag itself, to a position of prominence not make it an idol itself? It appears that non-denominational Christianity generally agrees that it's not an idol, but why isn't it? If it's contrived of by man, to be a reminder, and it's not overtly political by design (though at least in the case of the article, seems political by application) what real purpose does it solve?

I guess my question is why does a Christian church need to fly any flag? I understand the argument for the American flag. But I don't necessarily think "the Church" needs to fly either, and based on my limited understanding of the purpose behind the Christian flag, I'd be inclined to not want to see it flown... not because I don't esteem what it represents, but rather because it's not something we "need" as a Christians, is it?

Not indented to be troll here... the article just made me question why we have a flag to begin with.

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