Christian Bible scholar Thom Stark examines the weaknesses in Christian vs Muslim apologetics:
Christian apologists will argue that the Quran is full of contradictions and lies. On the the hand, Muslim apologists will argue that the Bible is full of contradictions and lies. And in point of fact, Muslims do a splendid job of pointing out precisely what those contradictions in the Bible are. It is much more difficult to find contradictions in the Quran, predominantly because it was written over a very short period of time and almost exclusively by one person; whereas, the Bible was written over a period upwards of a thousand years, at minimum by dozens of different authors. As a result, if internal coherency constitutes evidence for divine origins and inerrancy of a sacred text (as the Chicago inerrantists claim), then the Quan wins over the Bible hands down.
At this point, Christian apologists will begin a campaign of character assassination against Muhammad: he was a liar, he was violent, etc. Again, this introduces a double standard. After all, Moses (the alleged author of the Pentateuch) was a liar and an extraordinarily violent man. In fact, if the Bible is accurate, then Moses was exceedingly more violent than Muhammad. Moses killed women and children in the name of God, whereas Muhammad condemned the killing of women and children for any reason.
It does no good, either, to argue that many of the traditions of the Quran are dependant upon traditions from the Bible. The same thing is true of many of the traditions of the Bible. The story of the flood depends upon much older traditions, such as the Epic of Gilgamesh. The laws of Moses depend upon the earlier Code of Hammurabi. The vision of the “one like a son of man” in Daniel 7 borrows closely from the Ugaritic Baal cycle, and so on. Much of the Bible is a patchwork pastiche of broader ancient Near Eastern lore. Pointing out the differences between the Bible and these earlier traditions is irrelevant, since there are also differences between the Quranic traditions and their predecessors in the Bible.
Thom Stark, The Human Faces of God: What Scripture Reveals When It Gets God Wrong (And Why Inerrancy Tries To Hide It), p. 57.