Here I will categorize beliefs as depraved or undepraved. But first a few concepts.
By "science" I generally mean the scientific method. This includes hard science and soft science. Hard science includes theories that can be experimentally tested. Soft science includes theories that cannot be experimentally tested. Instead, a theory is the simplest explanation of the known facts that is then tested as more facts become available which either support the theory or disprove it. Ethics could be treated as a soft science based on history, anthropology, and evolutional psychology.
Plato introduced the modern concept of Truth. The Old Testament doesn't contain this concept of Truth. The New Testament includes Truth (explicitly in John 1) and therefore includes Plato. Without knowing Arabic, I cannot judge whether the Quran includes Truth. Science is independent of the concept of Truth.
Now I can describe beliefs:
Islam = Quran + Plato
my belief = Old Testament + science
Judaism = Old Testament + desire
traditional Christianity = New Testament + Old Testament
modern Christianity = New Testament + desire
traditional Atheism = Plato + science
modern Atheism = Plato + desire
modern culture = desire - traditional Christianity
Desire is the source of depravity or evil. It means putting one's desires above a reliable source. So now we can categorize beliefs by whether they are based on desire.
undepraved: Islam, my belief, traditional Christianity, traditional Atheism
depraved: Judaism, modern Christianity, modern Atheism, modern culture
Modern culture deserves special mention because it is even worse than simple desire. It includes a rejection of traditional Christianity which means that even a desire to do something good may be rejected because that good was supported by traditional Christianity.
This Undepraved group should welcome members of any undepraved belief. But let's consider these groups realistically. My belief is a belief with just one member, me. As far as I can tell, traditional Atheism is extinct. Traditional Atheism depends on an understanding of science. But human intelligence is dropping rapidly, so most people are not intelligent enough to understand science. During the European Enlightenment there were many traditional Atheists because intelligence was much higher. But that is over, so while I would welcome traditional Atheists, I don't think any exist. Traditional Christianity exists in traditional Anabaptism, but they don't need this group. Outside of Anabaptism, I suspect there will be very small numbers of traditional Christians in other Christian groups. I welcome them, but they will be few. And finally we have Islam. This is by far the largest undepraved belief today. So I would expect the great majority of an Undepraved group to be Muslim.
Stefan Molyneux is too verbose for me, so I don't listen to him. So I can't judge him. But I suspect that him and his followers would have no interest in an undepraved group, namely a group actually applying traditional religious methods to implement morality.