opinions are only opinions

is it the same then - that Arabaic in Mohammed's time would be understandable to Arabs today - in the same way that Aramaic of Christ's time would be understandable to aramaic speakers today?

"2- Mohammad was given with authentic last Revelation of God remained unchanged word by word even non-muslim scholars are forced to believe this truth."

Which non-Muslim scholars believe this "truth"? And if they believed it - wouldn't they become muslims? So then they would no longer be non-Muslim scholars?

3- Muslim Holy Land (Mecca and Medina ) have never been occupied by any non-muslim nation as victorious nation and can not be occupied till Doom's Day with bless of God (prophesized by Mohammad ).

It would be possible for any country with a large miltary to occupy Saudi Arabia - China, Russia, the US, the EU/NATO. They have not done so - but COULD do it. So you cannot say that that will not occur in the future - as rather obviously the future has not yet occurred. So your statement cannot be proven as true. It is just your belief.

4- Quran is the only scripture which tells science which way to go.

How does the Koran instruct scientists at Bell Labs working on photonic switches for example? Your statement has no proof - it is just a product of your baised beliefs.

5- Mohammad is the best example for all humans to follow. Even science proves as he slept , as he ate, …….. That is the best way. ( anybody who follows Mohammad not only finds happiness in this world but will be forgiven due to Last Prophet on doom's day )

As for food - are you talking about the 'Mediterranean diet'? That was around thousands of years before Mohammed - created by the Greeks & Phoenicians. As for the 'way he slept' - are you talking about in tents - or having multiple wives - or even a child bride? Is that good for you too?

You cannot say that 'it is the best way'. don't you understand the difference between your own opinion (however strongly held) and truth? They are not one and the same.

You cannot make statements about how much or little happiness your beliefs will bring to other people. Nor can you be absolutley sure that your 'glass of drink' is the best - simply because you haven't drank the others.