To this day we see them carry on things that are quintessentially of their Arabic origins.
One gift of Arabic origin is the invention by a Palestinian Arab of the cell phone bomb ... all else was either stolen from someone else or preserved for personal gain/reasons by some Arab. All else they destroyed/burnt - which includes most classical writers works, art, buildings, and nearly utterly destroyed classical Christianity to the point that only dim memories remain.
The second gift to western civilization is slavery in the form most people today think of it - as bondage, hatred, chains whips, and so on. (Classical slavery was more like indentured servants with no or few social restrictions).