There's been a lot of controversy in this. Some historians say that the aftermath of the battle wasn't "that important", but some others say that he "saved" Europe Christianity.
The matter of the Battle of Tours and the Arab-Berber campaigns in Gaul are complex, but along other posts, you might find some elements of answer in there : Was the battle of tours an insignificant battle? (u/libertat).
The current thought is that the "saved Europe" position is overstating things quite a bit. More can always be said on the matter, so if you have any thoughts about Tours, please feel free to make your own writeup! For the meantime, here are two previous posts on Tours: