Saudi Arabia is an indirect gift from the English, yes -- the Saud clan conquered other tribes in the Arabian peninsula, but this was with the blessing of the BRitish who sold out the Hashemites (traditional rulers of the Hejaz region - the westernmost strip alongside the Red sea which contains Makkah and Madina)
Syria and Iraq were cobbled together by the English and French, yes.
however, this "intervention" was post-WWI when the Ottoman Empire collapsed.
IF the BRits and French hadn't stuck their noses in then, there would have been a bloody ethnic war in 1920 -- that was just delayed by 90 years...
If that bloody ethnic war had happened in the wake of the collapse of the Ottoman Empire, it is likely that the Mideast would've split into countries along ethnic lines.
It makes no sense that there is no Kurdistan, for example.