The Catechism of the Catholic Church says the following about Islam:
"841 The Church's relationship with the Muslims. The plan of salvation also includes those who acknowledge the Creator, in the first place amongst whom are the Muslims; these profess to hold the faith of Abraham, and together with us they adore the one, merciful God, mankind's judge on the last day."Islam is one of the great monotheistic religions (along with Judaism and Christianity). So, there is a respect due Muslims, because if there is only one God, then logically we all worship Him, even if our understanding of Him (Trinity, incarnation, etc) is very different than Muslims. Yet, even so, Christians understand a belief in one God is not enough, because God is Trinitarian. Thus, Islam also has a faulty understanding of God as well. Furthermore, as with any religious system, beliefs can be distorted into violence.
All of us should speak out against the radical Muslims who wish to promote terror, violence, and hatred. But, we should also speak out against those who want the same thing and call themselves Christian or any other name. It does seem there is a much bigger tendency in Islam for violence, but we cannot indict all of Islam for the violence of some.
Pope Benedict XVI said, we need to seek "sincere and respectful dialogue" with Muslims. Why? Because:
"The inter-religious and inter-cultural dialogue between Christians and Muslims is, in effect, a vital necessity, on which a large part of our future depends."If we don't, the violence of misunderstanding and hate will grow.
Here is a great dialogue on the problems of violence in Islam and how we ought to react to them: