Re: world religions' holidays
because ..they were not preserved by allah...as allah did not want tp preserve that...with thousands of years..when human race ..and society became civilized...and cultured...and almost reached at its maximum..then quran was revaeled...at the heifghts..as it was best of allah revelation...for the best of whole humanity...once again i remeber you that...quran is not for muslims...for whole of humanity...previous scriptures were limited to particular nation...delivered by particular prophet for that nation....and for particular time and with each new one came down...previous was obsolete...and since there was not anything after quran ..so muhammad(pbuh) was sent not only for arabs but indians means pakistanis..indians and bangladeshi also...not for particular time but whole time till qiyyammah...
thats why ..quran is preserved as it was the last one..and is last one...but other scriptures were not permanent..but temperory..thats the reason why allah not preserved them..... best regards wasalam.
I don't buy this height of civilisation thingie. If God was waiting for a better peiod than he should have waited till now and we would have had the revelations in digital format which is easier to save and preserve and distribute.
BTW earlier you mentioned Zaki, do you think he became a good debator by not studying the other scriptures.