It does. I am not arguing that it doesn't. Certainly a Christian organization is going to act differently than a Satanic organization. Christians (true Christians) want to do right by their fellow man and follow the teachings of Jesus.
One's belief system (whether adopted whole or eclectic) also determines how one defines virtue (for want of a better term), but in what qualities are called virtues and how those virtues are to be practiced. NARAL thinks it's compassionate to kill babies in the womb. I believe I've read that some Nazis actually talked themselves into believing that it was best for the Jews themselves that they be exterminated.
On a more humdrum level, I'm old enough to remember when "Look out for Number One" was considered a despicable philosophy of life. (Well, ok, at least you didn't admit to it in public.) But Carl Rogers, Maszlow, etc. have changed all that: now it's your primary duty to look out for number one, though they don't put it in those words.
There's nothing wrong with looking out for number one, except that in times of crisis, number one doesn't have a lot of pull on his own. That's why our ancestors developed things like traditions, culture, and concepts of allegiance and sacrifice.
Philosophies of 'every man for himself' are fine for selfish individuals during times of comfort, but no society can survive on such ideals.