Hi Both
Great thread
Guru Nanak Dev Jis first message was meant in acceptance that religion is an illusion- maya- there is No Hindu and No Muslim hence no religion.
He is beyond caste creed, colour and form so He is beyond religion, He is One, we are One. No attachments hence no identity, just One.
Being Sikh is not being a part of religion, it's being a Student of the all pervading. Truth- which has existed throughout the ages.
The Tenth King in Dasam Granth Ji, relayed Gods words to us-
God sent people to teach Truth including prophet Mohammed and the Vishnu incarnations and they caused themselves to be worshipped as God instead, began teaching foolishness and starting their own sects including Mohammed circumcising his followers.
Finally He sent the Gurus to spread the undiluted, Pure Truth.