These days, Arab countries and Muslim culture are anti-science, but for a large part of Christianity's existence, they often had better medicine, mathematics...
There, fixed that for you.
Just because something was good in the past, doesn't mean it's still good now. Except for a few small pockets of enlightenment, the majority of the Muslim world is so anti-science it's shocking just how progressive their cultures used to be.
There are reasons for this (relating to something akin to the Catholic/Protestant divide in Christianity) but yeah, they're pretty much backasswords these days.