What're you talking about ??!!!
In Bhai Gurdas ji's vaaran , it's clearly mentioned WaHeGuRu mantra is composed by uniting the names of god in 4 yugas.
W - Wasudev (Satjug)
H - Hari (Dwapar)
G - Gobind (Kalyug)
R - Raam (Treta)
As per hindus , Parbrahm is the origin of all things
Hari means Krishna , and Krishna lived in Dwapar yug. But Krishna was named after Parbrahm , as Krishna means "attractor" , one of the names of brahm. Hindus slowly started equating Krishna to Hari.
Ramchandar is from treta, the son of Dasrath. Ram chandra means (moon of Raam) or that which reflects the character of Raam. So Raam was actually another name of Parbrahm.
Wasudev is from Satjug . Wasudev means "the residing lord".
And Guru Gobind Singh ji maharaj is from Kalyug. Go(earth / vedas/ knowledge) + bind (center focal point). So Gobind means "the focal point of knowledge".
So the mantar makes sense . And TBH , our current abrahamic kinda views of sikhi are far more superficial.
We really need to chew in our understanding the baani properly.
I agree we don't believe in hindu devi devte, but TBH karam , dharam philosophy is much older than sikhi . What was lost and found & something which was not earlier revealed is what we collectively call "sikh matt".
It's purely our egos that we despise at anything "hindu" , whereas we ourselves believe in concepts like Karam philosophy, Rebirth, need of Guru , etc which were first found in upanishads (concluding portion of vedas).
As per the vedantists , there're three different types of karams :
1) Prarabdha karam
This are the past karam because of which we got the current configuration in this earthly plane. These are the karams that have fruited . There is no way to extinguish the effects of these karams , except by bearing them , whether good or bad. It's like an arrow shot from the archer's bow cannot come back. It's destined to hit. Its too late now to undo the effect of the arrow. It only can be bore now.
Prarabdha karam makes up a person's destiny.
2) Sanchit karam
These are accumulated karams , from many lifetimes. Prarabdha karam is that portion of sanchit which is taken for bearing in this lifetime. I think sanchit karam are the first ones to be destroyed by naam simran.
3) Kriyaman karam
These are the current karam we're doing, the fruits of which we're destined to bear in the coming time.