I have a question about gay marriage, okay so I don’t see why us Catholics are so obsessed with gay marriage in the U.S.? In my opinion, it doesn’t matter if two males or females marry by law, so aslong as they don’t start marrying within our church. Is my thinking wrong?? I mean them getting married has no effect on us right? Because we don’t see marriage being official until you get married by church right? Any thoughts or opinions? (Please don’t attack me I’m just curious

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This is not a Catholic question. It is a question of common sense.
Is it good for a society to have common sense and uphold the observation of it?
What is common sense?
Common sense would be any conclusion that I can come to by observing a self-evident reality. For instance, it can be commonly sensed and agreed that the sun rises in the morning and sets in the evening, and provides heat and light, right? Any sane person can make this observation in common with any other person, hence “common” sense. To deny it is dishonest.
In the same way:
Human beings exist, right? What is the only way a human being can come
to be?
It is a tragic thing that this question must be asked, but it is maybe the most serious question facing us.
What is the only unique way a human being can come into existence?
“through the union of a man and woman”.
To deny this is to defy common sense and is dishonest. The equation of man/woman with any other relationship is a lie.
So what?
Think about the implications. We are talking about human life and to what degree we wish to recognize it, protect it, affirm it.
If the union of a man and woman is the only way you can exist, and you have unique worth in your existence (you do), isn’t that institution worth recognizing, affirming, and protecting?
If I said to you
“that person over there is skin and bones and has a bloated stomach”
using the dishonest logic above you could say “I think he is just like any other human being. I choose to deny what is self-evident”.
You might think this is carrying the case too far, but I would suggest that the unavoidable consequences of a people that lies to themselves about basic human realities will be tragic for everyone.
This is what is so powerful about the Gospel. It asks us “to see, to hear” what God has revealed.