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There's a misconception here . In Islam , what doesn't change is the knowledge of Allah about all there is to be and what there wasn't to be . All of what's happening until the day of judgement is written in the preserved tablet (Allaoh Al-Mahfouz) . But when it comes to messages before Islam , they were to their people and time and not the whole humanity . Thus , Allah entrusted them to their people and they are the ones who did the crime and altered what has been revealed to them and hid things . A crime which they will be judged for . But when it comes to the noble Quran , Allah promised to preserve it himself - through means he knows best of - and that is why it can never be altered . That's our belief . So the people of the book didn't alter the words of Allah in the meaning that they defied destiny and such , it is all known to Allah .
ok, I get that. It is how you see things... Fair enough. However, with no proof of corruption of the previous scriptures then it's impossible to prove Gods previous message was changed in the Old Testament. As we see Christ as the message rather than the messenger.. And Christ lives and is eternal.. Then that message must also be incorruptible. What of Joseph Smith and the revelation of Mormon?... He claimed this message is written on "golden plates" which is in heaven. You see it is a matter of personal faith, and you take on faith that which you cannot prove.

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You also don't believe in the staff becoming a snake ? Anyway , as said before , the main reasons for a miracle is proving the prophecy of a messnger or a prophet - there's a difference - , leaving no room for objection , reminding people that Allah is all powerful all knowing , and other things . So it shouldn't really directly benefit people financially or so .
Yes, I believe the staff of Moses became a snake. This was Gods way to show the Pharaoh the importance of Moses.. The aim of the miracles (10 plagues) was to show Pharaoh the power of the ONE true God as opposed to the numerous powerless gods the Egyptians worshipped. So the Pharaoh would release Gods people and let them go. So in this way they did benefit the Hebrew people at this time.. Eventually Pharaoh capitulated and set the people free... Yet reluctantly.

Miracles by by their nature would never bring financial benefit to anyone as God does not deal in cash.
Peace.