“but....they invented the zero....(or so it is claimed)”
Th zero was developed in India, before muslims invaded.
As with much of the innovation credited to Islam, it came into European thinking through Arabic translations and commentary, but had been developed by people that were conquered by muslims, or by minority communities within islamic territory, like Jews and Christians.
Kind of like the Mongols in that respect - their wide conquest opened up a lot of communication and technology transfer.
The concept of zero is reality, and was discovered by morons- not invented, or even close to developed. Really, BB- that is your best proffer? Good swing and a miss...