I don't see anyone having difficulty accepting what the Bible says. There are passages in the Law where the Israelites were to kill their own people when they transgressed certain commands. The Law was for a certain people, for a certain time, for a certain purpose. There are passages where they are to do violence towards other peoples, as a part of God's judgement of those peoples. But God also warns the Israelites that they will have things done to them by other nations as God's judgement against them.Some Muslims believe they can earn their godly righteousness by killing infidels. Some Christians believe that can earn their godly righteousness by the works of the law. The truth is, both Muslims and Christians miss-use their respective Books seeking their own form of godly righteousness.
Who's putting God on trial for the old covenant commands? What would be unwise, would be to discard the FACT that those WORDS are in the BOOK. Why is that so hard for some of you to accept?
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It seems to me that you are the one having a hard time accepting that the Quran commands Muslims everywhere to kill anyone who is an infidel, anyone who will not believe in Allah or that Muhammad is his messenger. As I pointed out to you before, and you failed to address, these verses in the Quran abrogate those earlier ones that speak of peace. This is not at all the same as the passages in the Bible; it is the reverse--the Bible begins with OT violence but that is superceded by the peace that comes through the cross.
So you have it all wrong. Those whom the news and liberals like to term "extremist" Muslims, such as ISIL, are actually the ones that take the Quran literally and do what Muhamad told them to do. It is the moderates that neglect their duty to Muhammad's commands. I suspect that they have significant difficulties with such commands and so try to rationalize them away. And they should.