So ignorant, like someone mentioned above (Not bothered to check), the moon and crescent was not used at the time of our Prophet (Peace and blessings be upon him)'s period, it was adapted later in the year 1400 or so, up until then plain black/green flags (I think) were used.
There is nothing in Islam to support pagan claims, you won't find any.
The Jews were black because they try distinguish themselves from everyone else, also with the Horus and his 12 disciples crap, that's all bogus and made up (I think it is?)
Now, the best part, the days of the week, we don't use those days (In islamic countries), the days have always been named day 1,2,3 etc.
The moonday crap was created by the pagan romans, they even had 10 months in there 'Year'.
Stop with these stupid claims, lol.
God's message has always been the same, worship him alone.
Messengers were sent to ALL nations.