The idea of nationhood is quite western
Yes, but not the idea of kingdoms or countries or empires. That is universal.
all the Arab countries that exist today were created by the British and the French
At the very least, Egypt, Lebanon, Syria, Iraq, Iran, Jordan and Saudi Arabia were not created by the British and French. You are confusing British imperialists drawing borders and then trying to impose those borders on existing countries with “creating” those countries.
Egypt, Syria, Jordan and Lebanon predate Britain as full fledged countries by thousands of years.