To non-believers, that looks like poppycock. If parts don't apply, perhaps we should publish Bibles with disclaimers on those "rejected" passages. And then there's that "All scripture is profitable..." thingy.
We cannot quote-mine the Quran and then complain when someone does the same for the Bible. Well, we can, but don't expect credibility.
My understanding is that the Quran is more or less an Arabic version of the Old Testament. And that Sunni and Shiite Muslims (who make up almost all of Islam) believe the Koran to have been word-for-word dictated by God Almighty. Ergo, the importance on those young minds--who I marvel over--that can recite the entire Quran word-for-word by memory.
The Christian view is that the Bible was not dictated word-for-word by God Almighty but inspired by God and written under that inspiration by men. A minute difference perhaps but I think it flavors the taste in which one consumes the literary pieces in which they read.
Christianity is a lot more divided than Islam as well. Protestantism alone is so divided by denominations, some with lesbian clergy, or far right wing pastors... that it's hard to talk of the Christian world with any coherency.
There are some fundamentals that all Christians accept though. They have to accept the Triune God belief. Lack of this may make a person neo-Christian at best.
Also, if Christians were so Old Testament then they'd be Jews. Pretty simple. You could have multiple wives under the Old Testament, but you are forbidden that under the New Testament by Jesus. So, to deny there is an effect in Old Testament interpretation by Christians reading it in or through the light of the New Testament is false I think. That's what primarily separates a Christian from a Jew.
Sociologically the Western World had the Reformation or revolt, whichever way you prefer to look at it, in Christianity. And in the Eastern world a Reformation or revolt of sorts took place to within the cultural milieu of Christians and Jews. It was called Islam. It's why some viewed Islam as a heresy of Christianity. However, you would actually have to be Christian to be a heretic.
I'm not a big critic of Islam. Actually, I can even admire the Islam jihadist at times. They are
hot, not cold, and certainly not the luke warm of his followers Jesus seems to indicate he dislikes (maybe not them personally as a whole, but that trait of being luke warm).
I once wrote a paper for an English class arguing that there are justifiable times for war. So, I looked at Catholic and Protestant writers on Just War Theory. But among some of the other sources I looked at were Muslim sources on Muslim beliefs about when wars are justifiable.
That process introduced me to the Islamic concept of the Holy Ummah. Which is the Islamic concept of the one holy community of Muslim believers across all planet earth. Nothing, no state, one of the founders of Pakistan I believe, stated can surpass the Holy Ummah. Nation-states can only be tolerated as practical for the needs of man, but can never be put above the Ummah.
The Ummah is somewhat akin to the Catholic concept of "Church." Except "Church" in Catholicism inhabits 3 spheres of existence simultaneously: heaven, purgatory, and earth. All human souls in heaven are
saints, in purgatory not yet saints, on earth souls will either eventually become saints in heaven or be damned to hell. This "Church" as a conception is in magnitude pretty much like the Muslim conception of the Holy Ummah.
So, the concept of the Ummah in part, in my views,
helps explain Muslim, religious jihads.
The other thing I'm of the opinion of, is that because doctrinal issues of emphasis, Christianity will always have a minority within it that are pacifists (even though Christianity isn't a pacifist religion) whereas Islam will always have a minority within it that are militant jihadists.
And by jihad here I'm not talking about "Greater Jihad" where the war and battles are within the individual spiritually.