Pretty much every time Islam is discussed and the violence of Islamic scriptures pointed to, some people bring up similarly violent passages of the Old Testament. Regardless of what their intentions are and as pertinent as such an analogy may seem to be on the surface, I think it is completely irrelevant when you get into the details.
To my knowledge, Jews and Christians have long since taken liberties with the strict letter of the Old Testament, and the fact of the matter is that the Qur’an and the Sunna have more than once strongly condemned them for that, thus issuing a stark warning to Muslims not to follow the same path. This is, in my opinion, one of the reasons why it is so difficult, if not impossible for Islam to reform itself the way Judaism and Christianity have.
There are, for instance, in the fifth surah of the Qur’an three verses that denounce “those who do not judge by what Allah has revealed”, calling them "disbelievers", "wrongdoers" and "rebellious" (verses 44,45 and 47). According to classical exegesis (Al-Tabari, Ibn Katheer,...), these verses most probably concern a group of Jews who did not enforce the stoning of adulterers. Muhammad insisted they carry out that punishment.
Although those texts were written in connection to a particular group of people, their wording is general and they apply to anybody who fits that description. As the saying in Arabic goes:
العبرة بعموم اللفظ لا بخصوص السبب
العبرة بعموم اللفظ لا بخصوص السبب في فهم النص القرآني| الشيخ يوسف القرضاوي - YouTube
This is why these verses are frequently invoked by Islamists in general, and jihadists in particular against the regimes who rule the Muslim world and who do not, for the most part, enforce Islamic law in its entirety. In contrast, I have not heard of any fundamentalist Christian demanding that the Old Testament be put in practice to the letter. I am definitely not knowledgeable enough about Judaism, so maybe there are fundamentalist Jews who advocate stoning adulterers for instance.Let me know.