Other than through a brain MRI ( magnetic resonance imaging ), we cannot 'prove' the existance of love either but we pretty much universally acknowledge it's existance. Faith, like love, we will have problems quantifying it yet we agree that it exists. As someone who's background is heavily based in science, I make most of my decisions based on science and reason. However, as a priest, I also must acknowledge the 'human factor' and our need to have something 'larger than life' that looks over us and is responsible to and for us. Call it God, the Force, Karma, Gaia, whatever, the need is still there for many of us and it would be foolish to disreguard that aspect of humanity. That's actually why I became a priest BTW. I was atheistic prior to that. For many years, the Church declared that the world was flat. Obviously, they were wrong but the human need for that sort of structure is still needed for the emotional well being of many people. Some individual people/organization abuse that fact but they are in the minority. By and large, the Church supports the emotional needs of the folks that have that spiritual need to know that 'God' is watching out for them.
Those of you that base 'all' your decisions on science and reason, quantify that mathematically.
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and if you don't need to know that god is watching out for you? Kinda leaves a giant hole in the theroy of "humans NEED to have a religion to believe that theres SOMTHING out there that caused all this" doesn't it...