1)What is your religion's stance on Christianity and Christians? Will Allah forgive those who believe that Jesus is his son? Or does he condemn Christians (and likewise Jews) to hell for their beliefs?
For Muslims, Christians are MISS GUIDED by other humans from the real true path which Amazingly and Ironically found in the bible in clear way.
who will go to Hell and who are not is Only Allah (swt) decision and after all we enter Paradise only with HIS MERCY, but what Allah (swt) said in Quran is that Only ISLAM religion will be accepted,
and Islam is the religion that all Prophets including Jesus and Moses may peace be upon them all called for it!
as ISLAM means Submit to the WILL of ALLAH (swt), you will not find in bible Jesus saying your religion is Christianity even Judaism is coming from the name of tribe!
2) Many Qur'anic verses I have read promote aggression, slavery, and taking advantage of subdued peoples, sexually and violently. Are these verses contemporary issues that no longer hold precedence in the world we live in now, or are they to be held true today? And if neither, is there some sort of context I am missing?
All verses in Quran apply till today, Islam covers all aspects of life, which means during Peace and also during war, Islam is religion of Peace, and all verses that used in anti Islamic web sites taken out of context and without mentioning when and why and were this or that verse where said!
You can find Quran is the only book that gives right to slaves, beside giving gradual solution to this social problem at that time!
And I dont know what you mean by sexualy!?
3) I am curious as to what the general Islamic feeling for groups such as Hamas, Hezbollah, and al-Qaeda is. Some Muslims I have spoken to openly praise them in all their violent ways, and others speak out against them. What is the majority feeling towards them?
Islam is fought now days and actually from long time, but we can say enemies of Islam were busy with soviet union before, anyway it is all about Power, OIL, Gas, weapons and Israel etc...!
Each group from what you mentioned facing different enemy and different situation, so we cannot give one opinion on all of them, when there will be Islamic Caliphate then we will have one Opinion that expresses the opinion of all Muslims!
May Allah (swt) guide us all!
Peace