You are very welcome
Ahh I think I see what is going on here. You are trying to understand Sikhi from an Abrahamic perspective. I was too, when I started. There is a huge problem with going about it like that. What has happened is that Abrahamic missionaries and scholars, in an attempt to categorize and subsequently subdue alternative religious thought, systematize other religions into simple lists. The result of this categorization, is a classification of belief systems into "Religion". Sikhi is not "a religion", because the word religion carries with it immense baggage borrowed from Abrahamic theology and academia. By answering missionary questions like "are you mono or poly", "what are your primary commandments", "what is considered sin", etc... we conform our understanding of Sikhi into a pre-shaped cubby defined by the Abrahamic understanding. This reduces our conceptual understanding of Sikhi into predefined definitions that are colonial in nature-- they are not our own.
That is why you are asking for the "fundamental dogmas" of Sikhi, I wanted to know myself, coming from an Islamic background, that is how I tackled Sikhi and tried to comprehend it; I soon found out that Sikhism does not fit into Abrahamic cubbies.
A general definition of dogma would be authoritative religious laws, deemed to be absolutely true, without any sort of proof. An example would be that all non-believers are going to hell in the after life.
Seeing as most of these laws come from sacred scriptures and texts, it is only fitting to first search the Guru Granth Sahib for any “laws”. Yet when one does read the Guru Granth, (which unfortunately is not too common an occurrence) we realize that that such a search would be in vain. While one is likely to find the praise and glorification of God, a call for Simran and Kirtan (meditation and recitation of the hymns), and even some words of a morale boosting nature, we cannot find any sort of “laws”. Why is this so?
The Gurus’ goal was not to set out how many times to pray, what to eat, or even how to eat it, but rather to create humans of such high moral character and thinking that they would be considered model citizens for any country. If there are any laws in Sikhism, they are ones of such universal nature that most, if not all of them would be found or represented in the International Declaration of Human Rights, or any other such charter.
How can Sikhism, based on divine hukum (accepting the will of God and living within it), not have any laws? What do the followers follow? Moral values, of trust, honesty, hard work, and many more are told to be means of reaching the ultimate goal of oneness with God, but there are no commands or orders. In other words Sikhism was made as a way of life. A philosophy of hard work, praise of the one and only Lord, and service to humanity. This is the beauty of Sikhism. Through Gurus’ infinite knowledge, they gave us neither laws nor orders, but rather extremely beautiful and universal poetry. Poetry which tells us how to be good human beings. Dogma, in every sense of the word, is contrary to the Sikh belief.
Sikhi does not concern itself with the afterlife. There is no promise of rivers of wine or 72 virgins waiting for you upon death. Sikhi is about living this life, here and now, and not worrying about things that are out of your control. It teaches us that we must all make the bed we sleep in, that there are consequences for our actions, not when we die, but during this life. All of us have free will, we can do whatever we want to do, the important thing to realize is that every action has a reaction, your actions don't just affect you, they affect the people around you as well. Guru Granth Sahib emphasises over and over again the need to be in control of your desires, wants and most importantly, your mind. Guru Nanak went as far as saying ""By conquering your mind, you can conquer the world." We are taught to think for ourselves, rely on our judgement, reason and logic, but to do that, we MUST be in control, you cannot walk that path if you are a victim to your mind, your wants, your desires.
One of the main goals, if not the single biggest goal, in Sikhi is to harness our minds. To make the mind a tool for us, not against us. There are 5 vices that we must constantly battle to be able to rule our minds - Kaam, krodh, lobh, moh, and ahankar. That is: lust, wrath, greed, attachment, and ego. This is the guidance from our Gurus, to not be slaves to our urges, but to use them to our advantage.
Sikhism is not the right path for someone who wants to walk through life sucking the thumb on one hand and holding onto God's finger with the other. We are allowed to do what we want. God is not here to baby us, tell us what to do in every situation, we are supposed to be self-reliant, self-dependant, to have faith in ourselves and be able to make the right choices on our own. The Guru Granth Sahib, like I have already mentioned, is not a text of rules and regulations, punishments and rewards. It is here to enhance our existence, not dictate it, it is a guide, the choice to listen and apply it's message is up to us.