Dear brother Salam
""It is several different interpretations and viewpoints of the Quranic words which we are seeing/reading. ""
41:42 No falsehood can ever approach it openly or in stealth, in the past, present or future, a revelation from all Wise, Owner of praise.
and the falsehood of manmade rituals can never be justified from Qur’an .
""In this scenario whatever is reached to us as practice may have been altered and lost some of the actual structure but it should not be so corrupted that we do not find anything correct in practice""
19:59 But after them came generations that abandoned the Divine System and followed their lusts. Soon they will meet utter disillusion.
Practices transferred to subsequent generations were not only a reflection of the lusts of preceding generations but also against the Divine System and because of this reason the concept of TAWATUR (Continutation ) is a Non Qur’anic concept and Qur’an condemn this mind set .
11:109 Be not in doubt about the end of those who worship idols in any form. They only blindly follow their forefathers. They and their forefathers will get their due portion according to Our law.
""It is very hard to believe that for centuries the Muslims were following just the corruption and there were no sincere Muslims existed during this long period of time who would have tried to restore the truth.""
Pls read following verses
12:106 The majority of those who believe in God, do not do so without committing idol worship (in different forms).
[Mushrik = One who calls upon gods besides God = Associates others with God = Believes in false deities = Ascribes partners to Him = Submits to false authorities = Prefers clergy over revelation = Commits idol worship in any form]
6:116 (People will confront you with what the majority is doing.) Now if you pay heed to, or get intimidated by majority of those who live on earth, they will lead you astray from God’s way. Most of the people follow nothing but conjecture and they only live by guesswork.
""Difference between muslims and other religion is that they had altered their books but it was not the case in Islam.""
But Muslims have made Qur’an Mahjoor
25:30 And the Messenger will say, “O My Lord! These are my people, the ones who had disabled this Qur’an making it of no account." [Mahjoor = Disabled = Abandoned = Neglected. They had immobilized it like villagers who bind a cow by tying her front foot to her horn]