God through Gurbani & Science. The writer of the book has done a-lot of research and almost all of writing within the book reference Brahmgyanis, scholars and other mahapurkhs as the source of what he put down. If there's anything in particular you want to read I an upload it here, I really don't mind. Or message me and I'll send you it.
The hierarchy is something like Indra<Brahma<Shiva<Vishnu<Maya
As one passes another takes his place, same for the other trinity.
Guru Ji wanted us to worship the Supreme Lord, not the Devtas. I'm speculating here (as I could never hope to understand what Akaal Purkh Saroop Guru Gobind Singh Ji Maharaj was thinking) but if these secrets were all released at the time then there was nothing stopping the Hindus just worshipping a respected Sahibzaade to continue Devta pooja.
The universe is so mysterious and vast, heck if you read other scriptures there's interesting details about why certain avatars of Vishnu had to take birth through the womb. These facts are omitted from other texts.
Probably the ones that are contained to our brahmand (Galaxy) since each region has its own trinity.
Again im just speculating.
You dont need to tell me that penji the main issue arises when everyone tries to link Sikhi into everything, rather than treating it like a full picture they see it as a jigsaw.
In my work, I have to deal with lots of frustration and once in a while I literally feel punching wall. Anger is very bad. I find some ways by not letting steam getting filled in my head:
Start saying “NO” when you meant to say no. Don’t take any project whether at home or work. It may offend other person but it will be quick and short term. If you say yes and then you end up not doing it and start making excuses etc will end up having 2 hot heads clashing with each other.
Music helps a lot. Listen to classical music or a soothing simran or mool mantar jaap helps diverting your attention to positive-ness.