Guru Nanak Dev Ji was sent by Vaheguru, Gurbani is from Vaheguru directly and the Khalsa is Vaheguru’s army. So, none of these are man-made, all of these are divine-made. Guru Nanak Dev Ji became a Guru not from any other human Guru. They were made Guru by Vaheguru directly. Gurbani is a revelation from Vaheguru directly given to us. Guru Granth Sahib Ji is the embodiment of Vaheguru’s light because it has got the whole message that we need to be enlightened. Guru Gobind Singh Ji started the Khalsa Panth upon the order of Vaheguru. Guru  Ji has stated in Their Bani that Khalsa is Vaheguru’s army and Khalsa works for Vaheguru’s Victory. 

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