Sikhisn was there till the Gobibd Singh batiste the 5 pyare. Non of the Guru from the 1st to 9th gave any instructions to cover the head. Even the 10th never made it compulsory for every Sikh only those do the amrit pan
The first phase of writing Guru Granth Sahib was completed in presence of Guru Arjan. So I guess by that time he would have surely made sure Sikhs came with heads covered. The concept of Miri Piri and keeping 2 Kirpans was started by Guru Hargobind.
Guru Gobind Singh only formalized certain aspects of religion. He gave us the starting point. Amrit is the starting point in a way. When people used to take pledge under the first 9 Gurus, they used to take Charan Amrit.
The majyada is set up by men after the gurus were gone. Now if this marjyada passes that will become the law just like the other marjyadas.
I guess you are more than wrong here. Maryada is based on lives of Guru themselves. They lived this life, Sikhs followed it and that's how it is. Every now and then, I come across an aspect of Maryada reflecting in Guru Granth Sahib or Nitnem Baani shabad, any of Guru's Saakhis or Bhai Gurdas ji di vaaraa. We have great Sikh literature which we need to read a lot before we come to any assumption.
It is mean that those who don’t take amrit are not Sikhs?
I cannot comment on this without being judgemental and wrong. But if you know the worth of taking Amrit, and you have not taken.. then one should know that they have to submit their head and ego to Guru. They should think of it as a payment which is long due.
What shall one do as far as going to the think pot? How can we not listen to bani then?
This reminds me of a story. One guy goes and asks the priest.. can I smoke while remembering God? The priest says no. Other guy comes to know of it. He goes to the priest and asks.. can I remember God while smoking? The priest says YES. In the end, both guys know what to do and what not to do. They are just wasting time asking such questions.
In a generation not far far away, people used to refrain from taking books inside loo. They wouldn't want Vidya to go inside there. Ways have changed. But I would say over the years the whole notion and general standard of being 'respectful' towards something has come down.