There is no such thing as Islam.
Islam is not a monolithic religious entity with one defined set of rules, there is in fact many Islam's.
To say there is an single 'Islam' is like saying there is a single 'christianity' which includes protestantism, Jehovahs Witnesses, Seventh Day Adventists and Catholics as they are all the same.
They are not. Go and ask the people in Northern Ireland if Catholicism and Protestantism are the same.
They each use the Bible as the basis of their faith, but each have massive doctrinal differences.
This is why each will kill the other in the name of some minor doctrinal differences.
The same is with the Islamic religions.
They each use the Koran but each are fundamentally different.
A Muslim can reject Sharia Law just as a Christian can reject Christian Fundamentalism.
One can be a Muslim and a Christian without being a fundamentalist nutter.
The problem is always the extremists - the Sharia law nutters, the Christian Fundamentalist rapture nutters, the Zionists and the Islamists etc etc.
This is why the enemy is not Islam, but Islamism.
This is why the problem is fundamentalists not Muslims.
To say the problem is Islam or Muslims is simply wrong.
One can be a decent human being and a Muslim just as one can be a decent Catholic priest and condemn the pederasts in the Church.
The problem is when people conflate Islamists with Muslims or pederasts with the Church and try and say the problem is Islam or the Catholic Church - it isnt.
The problem is fundamentalism and evil individuals.