No, specific day can be considered "owned" by paganism. The fact that Christians celebrate many of their feast days on what were pagan holidays is to avoid paganism....
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M*W: So, you are saying that if one celebrates Catholic feast days, it is to avoid Christianity?
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As to the answer how three can be one. It's Love, and it's clear that God who is loving must create love, yet love cannot be created without division into what we would call persons.
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M*W: What's love got to do with it? How is this "clear" to you? Please explain. I don't see where God "must create love." That's a human emotion. Since the emotion is human, it only dwells within humanity. I understand that "God IS love," but God doesn't "create" more love. Love is positive energy, and we've already learned that energy can only change what's already there in existence. It can't diminish or increase.
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But there's no contradiction in what the Trinity says.
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M*W: I didn't know the Trinity could talk! What language does the Trinity speak?
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The Church does not say three persons are one person, but there the three persons share one divine nature. Christ said, however, not that his will be done, but that the Father's will be done.
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M*W: Funny, but when I was Catholic, my priest always said it was "three personalities in one God=the "triune." If JC was really God, he should do his own will, because allegedly JC was an extension of God on Earth (just like we are). JC made it quite clear that he, like all humanity, is the child of God. The ONE thing we share is the One Spirit of God. There is the Creator=God, the Created=Humanity (Son of God), and the One Spirit of God which dwells within all of Creation, most especially, the human race.