So as far as I can see, morality can be understood by fairly simple logic, if you abandon selfishness/egocentrism. It's mostly about the willingness to see the perspective of others than yourself, and I don't think it requires anything religious. I've basically learned it from all the times when something bad was done to me. And you learn that if you do bad things to others, it always comes back to you, so it doesn't work.
What you're saying here is that your personal suffering provoked some level of morality or, better said, conscience, in you. So maybe we need to ditch the idea of religion or religious belief being the basis of morality, or being required to rationally justify acting morally, and supplant it with suffering that leads to the development of true conscience and therefore empathy.
This is not to say that people can't do the right thing without religion, but still, there needs to be something more IMO, at least in my experience.
I think so, and I think that 'something more' is suffering that leads to conscience and empathy. That idea certainly aligns with the Cs philosophy, and the often-promised 'help is on the way', apparently in the form of mass extinction. A pretty weird idea on the face of it, but maybe not when thought about in terms of the crucial role of suffering in true human moral/spiritual development.
No, you must strive towards the Good and the Beautiful in every second of your life, with every breath you take. But since we humans forget ourselves all the time, and it's so difficult to boot, we cannot do this without a motivation and dedication of supreme power.
I think standard religious belief is like training wheels for humans in the process of developing true morality and conscience. As you said, 'doing good' or consistently meeting a 'higher' standard of thought, word and deed has always been difficult for most people, so having some motivation in the form of 'do it or you'll be punished' or 'do it and you'll be rewarded' is useful to encourage positive habits in the hope that they 'stick' and help the person to grow in the 'right' direction.
But again, I think you need more than that - and that "more" does point towards a higher realm of some sort, however you choose to think about it. It could also be a connectedness via our higher centers to the realm of "objective morality"
I think the latter is more probable, but maybe not a connection to "a realm of objective morality" but rather, as you say, (and again in line with the Cs philosophy) to a 'higher' part of ourselves, which is a connection we
can grow and increase, even if it is often via some level of suffering.
Monkeys can act with a basic moral code, but they can't rationally justify it.
But monkeys don't
need to rationally justify it, they just act morally, which seems a pretty convincing argument for morality not being dependent on rational justification. Of course, there's little to be gained from comparing monkeys to humans as regards morality. There are clear differences between (most) humans and monkeys, and there is monkey morality and there is human morality, and humans DO rationally justify morality (because they reason in a way that monkeys don't).
Harris justifies his morality by saying that moral acts simply make rational sense when they are thought through, and he presumes that atheists have thought them through (because they have to in the absence of religion or something 'higher' to justify morality). This the reason I think there was no meeting of minds between Peterson and Harris in their talks and why they just seemed to go round in circles or come back to their basic opposing stances over and over again.
I think the main valid argument by Peterson for the necessity of some kind of religious underpinning to morality, and to which Harris had no real answer, was that some belief in the transcendent is necessary for humans at times when suffering becomes so great that the individual risks either giving up completely on life or becoming violently resentful towards life and seeks revenge on life itself. At those times some form of religious belief can be vital to give some kind of meaning to suffering and help to prevent a person falling into a destructive pit.
There's a caveat though, I think, and it relates to why Harris isn't able to accept this point: two human beings will not necessarily experience the same suffering in the same way, or to the same 'depth'. Peterson actually made this point in one of his talks with Harris (that religion is necessary to give meaning to suffering) and I had the distinct impression at the time that Harris didn't really know what he was talking about, that is to say, that when Peterson talked about great suffering, Harris' personal reference for that was very different to Peterson's
So the other important (I think) caveat in all of this is, there doesn't seem to be a one size fits all as regards morality and religion and its application to human beings, and we need to remember that when we reference it, necessarily based on our own experiences, there may be relatively very few people who have even an inkling of what we are talking about.