Most atheists I have talked to in this day and age more or less have a strictly materialist view of the world, and typically say that man is no different than an animal.
This makes me wonder how atheists can logically justify having morals; for example if rape, torture, or murder aided one's own survival or the survival of one's group why should they be off the table?
So, are you saying that it's only the threat of eternal damnation that prevents you from raping, torturing and murder?
No I believe morality can be found in universal metaphysical laws.
If someone believes the physical world is all that exists though where does their knowledge of right and wrong come from?
From Listening.
From Observing.
From thinking and feeling.
From living.
I suggest that no one needs to read a Holy Book or identify with a particular religion in order to know that some things, such as murder and stealing, are just plain wrong. There is one fact that completely destroys the theory that only religious people are moral people and it is this: Atheist – at least many of them – are in fact moral. I have had many atheist friends over the span of my long life and most of them were moral beings. They didn't rape; the didn't steal and they did not commit adultery with their best friend's wife. They were trustworthy and caring; good neighbors and good friends. This I have learned and this I know absolutely: being an atheist does not make one immoral and being religious does not necessarily make one moral.
There are some religious behavioral codes that atheists would find intellectually and morally repugnant, such as the doctrine of “once saved, always saved”. Some Christians who embrace this belief are convinced they will not lose their salvation no matter what they do after acknowledging Christ as their Savior. The following words were uttered by a religious man, the founder of the Lutheran Church:
"Be a sinner, and let your sins be strong, but let your trust in Christ be stronger, and rejoice in Christ who is the victor over sin, death, and the world. We will commit sins while we are here, for this life is not a place where justice resides... No sin can separate us from Him, even if we were to kill or commit adultery thousands of times each day” (
Let Your Sins Be Strong, from The Wittenberg Project; The Wartburg Segment, translated by Erika Flores, from Dr. Martin Luther's Saemmtliche Schriften, Letter No. 99, 1 Aug. 1521. See, also
The Christ by John E. Remsberg, Item 525).
"Sin boldly but believe more boldly. Let your faith be greater than your sin. . . Sin will not destroy us in the reign of the Lamb, although we were to commit fornication a thousand times in one day" (Letter to Melanchton, August 1, 1521, Audin p.178).
According to Luther, the more you sin, the stronger your faith. Only those who were unsure of their salvation would hesitate to sin. Atheist have no deity to make their sins acceptable; therefore it seems they would be less inclined to engage in such conduct.
But this is only my humble opinion (OK, I lied about the humble part).