There are Muslims who make it an important part of their polemics to accuse Christians of immorality and the Bible of condoning or teaching immorality.
Many Muslims who desire to see Islamic law established also in western countries point to the manifold immorality found in these societies and claim that it would not exist under an Islamic government. Even if true, the price is too high, see Top ten reasons why sharia (Islamic law) is bad for all societies, but it is not even true, as can be seen in these articles: How a British jihadi saw the light, Jihadis and whores, etc.