In the name of God. Salam.
You are right about studying a faith with her own texts and especially with the doings of the founder of that religion (as per us Muslims, though, the person who continuated/perfected it, i.e. Prophet Muhammad).
Because the doings of so-called subscribers of a faith may not represent that faith. And yes, you are right, Christianity is not immune to this tragedy. And we can't judge Christianity with the doings of extremist Christians in the Central African Republic or Nigeria for instance. Because their actions may not be according to the Bible and teachings of Jesus. And likewise, the actions of some Muslims may not be in unison with the teachings of Quran and Prophet Muhammad.
Now, I believe the problem can be solved by studying Quran and actions of the Prophet Muhammad (and as per shias Ahlulbayt also) who were the embodied Qurans, meanings that they were criptures of God in flesh. And studying both the "recited scripture" (Quran means "Recited" btw) and the speaking and living scriptures (Prophets and Ahlulbayt, but as per shared/agreed history by Muslims of all denominations) would help us have a clear and unbiased view.
And, I call every non-muslims and muslims as well to study Quran but with different outlooks. (For a concise study, please refer to:
.:: www.Maaref-Foundation.com ::.**** The Holy Qur'an (Suras) For a detalied study you can refer to
Tafsir al-Mizan ) And to study the Life of Prophet Muhammad (s.a.a) but again with different, namely, shia sources. (e.g.
The Message | Books on Islam and Muslims | Al-Islam.org &
http://www.iranianmovies.org/index.php?topic=305.0 &
The Life of Muhammad The Prophet | Books on Islam and Muslims | Al-Islam.org etc. )
And as for your questions on selected/highlighted Quranic verses and actions of Prophet Muhammad. It really is about the way one studies them. If we have an agenda to see and interpret things in a bad way (rather to distort the faith to fit in our agenda, as some Muslim arrogants have done. or to reject the religion of Islam totally, as some non-Muslims have done), we can do it. And if we have only the aim of studying unbiased in order to come to a healthy conclusion, we can do it also. The question is, which one do we choose. For a scholarly study of this issue, please, see "A Secular Jewish Scholar" (as Lesley Hazleton describes herself) speaking on it in a shia islamic centre:
[youtube]2-hTxDvRVlo[/youtube]
Lesley Hazleton: "Prophet Muhammad : Where did Humanity Go Wrong?" - YouTube
Now, to me, (speaking of the version of interpretation of Quran and lives of Prophets and Ahlulbayt I studied and embraced) ; Islam is the religion of peace and justice. But, sometimes, the way people describe peace and justice differs. For instance, the way you describe the actions of Prophet Muhammad, which probably you studied or saw highlighted examples in sunni version of Islamic history, might be a bit violent. And though, not everything narrated about him in sunni sources might be true, I need to say that, sometimes we can see even the correctly narrated things different. Thus, to me, again, Islam is the religion of love and peace. But, the understanding of love in Islam is not hypocrite. Islam could not and can not love all. Thus Prophet Muhammad couldn't allow those who buried their daughters alive for instance. He needed to stop them by preaching. And such things if considered crimes, then let us all be criminals. Thus, I believe, we need to study the history, especially with shia sources and try to be unbiased and we will see it more clear. Thanks. ma salam
What did Jesus and Muhammad teach us ? - Sayyed Muhammad Hussein Fadlallah (r.) - YouTube