Where it came from and by whom is irrelevant when we are told to judge everything we do from what the Qur'an says. The Jews pray like us, namaz is Zoroastrian, Jesus fell on face and prayed to God, but what does Allah say we should be doing? Obey His Commands in heart, mind and hand.
If you want to drive on the left hand side of the road, the Qur'an gives no instructions, so consult and decide for yourself. No-one has the right to say that driving on the right hand side is an age old practice of our ancestors given by Allah so we must only do it this way. That is the situation with the namaz ritual, somewhere in time human beings started bending down before their gods and made it a religious obligation for muslims when there is no such instructions to do so.
Qur'an: ONLY FOLLOW WHAT GOD HAS REVEALED AND STOP FOLLOWING ANCESTORS:
2:170 When it is said to them, "Follow what God has revealed", they say, "Nay! We will follow the ways of our ancestors.” What! Even though their ancestors (and the ancient Imams) were lacking in understanding and were not rightly guided? [5:104, 10:78, 11:62, 11:87, 21:53, 34:43, 38:7, 43:23. Hudan and derivatives = Prominent = Bright = Lighted = Clearly visible = Leading = Guidance = Lighthouse = A well-lit road = A landmark of identification in the desert or sea]
2:171 The likeness of such blind followers is that (of a herd of sheep) which hear the shepherd’s call, but hear in it nothing more than a sound and a shout. Deaf, dumb, blind, for they do not use their reason. [This is subhuman level of existence 7:179. ‘Unq = Shepherd’s call. Shepherd here pertains to religious leaders who have learned some meaningless words or tenets, and a herd of sheep is the masses that blindly follow them. Kufr embraces blind following in addition to denying, opposing, or concealing the truth. Perceptual senses alone cannot distinguish human beings from the rest of the animal kingdom. It is the intellectual analysis that sets them apart]
When will they learn?