In regard to the violent stories in the OT, it is a bit tricky. The CCC (Catechism) states the following
121 The Old Testament is an indispensable part of Sacred Scripture. Its books are divinely inspired and retain a permanent value, for the Old Covenant has never been revoked.
Placed within the context of the OT, we Christians have inherited the history and the growing pains of the Israeli nation.
However, we are not bound to accept a literal interpretation of the OT books. (I hope I am not misrepresenting some official position on this

)
You are right, Ontheway.

Basically for Christians, they are followers of Jesus. That’s where we get our identity and all our lives are geared towards following his teachings and the personal examples he did on earth which, if said in simple words,
Christians are to live out the Gospel.
The Old Testament is part of the compilation of the Bible and it is fulfilled in the New Testament. Jesus himself fulfilled it. **Muslims’ problem with how Christians treat the Old Testament is they thought we must follow every iota, every word of the Old Testament just as they do with the Quran. **
There is even a thread by a Muslim poster here that asked,
if Jesus followed the Old testament then why did he asked the Christians to reject it, a premise that does not exist for us. Unlike the Quran, the Bible has a sequence though not exactly a history, it nevertheless narrates the experience of
God’s plan of salvation for mankind came about, which you rightly mentioned through the up and down of the experience of the Israelites. Thus the Old Testament culminates in the New and that is how Christians see their religion – a rich source of history and life biographies of the Biblical figures from which we can learn from.
Not all the Old Testament were rejected however, the moral laws which is unchanged is still held by the Christians while the ceremonial and civil laws of ancient Israel are discarded because they have either become obsolete because of the changing of time or being fulfilled by Jesus.
Basically when we talk about the violent in Islam is this: Do Muslims have to follow all the teaching of the Quran, for example, Jihad or merely parts of it? I thought Islam is not divided into moral and civil laws in a sense because basically for it is a government, a nation, and that was what Mohammad did – he set up an Islamic nation and thus have to follow all the civil law, the ceremonial law and of course the moral laws. They do have the Hudud and the Syariah, a purely Islamic government that governs the way of lives of Muslims in living and worship.