"All Sikhs are Khalsa"

From my research of Sikhs and their practice, the current Sikh Rehat Maryada is inspired by the Guru_Granth_Sahib.

However, it is a recent document approved by the Panth in 1950 when mainstream Sikhism predominated the Sikh religion.

Much of what is supposedly traditional Sikh in culture is actually influenced strongly by Hindu culture.

Overall though, all Sikhs are Khalsa. No edicts by a high priest are binding, because the last Guru Gobind Singh left no such instructions.

Regarding the Five K's, the only thing Gobind asked was for all Sikh males to wear five kinds of spiritual weapons.

Instead, only the Guru's Word is binding, not what one Sikh priest says. This Guru is the Sikh holy book, the Adi Granth

For all Sikhs are worthy of forgiveness if the act of meditation on, singing and chanting God's name causes them to forsake violence for peace.

At least, this is the impression I get from the Sikh concept of Nam Simran.

This is all that Guru Gobind Singh asks of all Sikhs:

He who meditates on the Supreme Light, night and day, and believes not in another, has perfect love in the heart and puts not his faith in fasting, tombs, graveyards and convents, and for whom the pilgrimages consist in being compassionate, charitable, chaste and self-disciplined and who recognises in all no one but the One alone, and whose heart is illumined with the Divine Light is a Khalsa, purest of the pure. (Guru Gobind Singh, 33 Swaiyyas).

References:

Sikh: http://en.wikipedia.org/wiki/Sikh
Khalsa: http://en.wikipedia.org/wiki/Khalsa
Sikh Rehat Maryada: http://en.wikipedia.org/wiki/Rehat_Maryada
Guru Granth Sahib: http://en.wikipedia.org/wiki/Guru_Granth_Sahib
The Five K's: http://en.wikipedia.org/wiki/Sikh#Five_Ks
Nam Simran: http://en.wikipedia.org/wiki/Naam_Simran
Guru Gobind Singh: http://en.wikipedia.org/wiki/Gobind_Singh
All that Guru Gobind Singh asks of all Sikhs: http://www.sehajdhari.co.uk/code.htm