"This issue of Filioque WAS THE CAUSE of the Schism."
I must respectfully disagree. That is an extremely simplistic approach to a very complicated question regarding the scandalous division between the eastern and western branches of Christianity. A detailed discussion on the origins of the great schism is beyond the scope of a post or even a short essay. That said there is an excellent article which I believe provides some good background on the issues which lead to the schism and contribute to its perpetuation.
http://www.arimathea.co.uk/schism.htm
Often the truth is simple. And I am aware of several "learned" and complicated obfuscations of this matter. But they are false.
The plain fact is that Western Latin Church had the Filioque and the Eastern Greek did not have. Since the Pope of Rome was convinced that Greeks are in error, when they refused to include the Filioque in their Creed he excomunicated them. Period!