I haven't seen these books, much less read them, to know whether what is being said about them is true. 

Regardless of that, if the nature of the books is contrary to a Christian's life then its just a bit more about the secular (worldly) society in which we live.  And its the very same culture that the Apostles confronted with the churches in Corinth and Thessalonika and others.  They didn't concern themselves about changing that culture rather they were concerned about those who had "put on Christ", their on-going conversion, and the call to faithfulness to Him.  Christianity has never influenced anyone by war or protest or attack or assault or injury or insult; rather by our undaunted love for Christ and each other millions have come to Light because this love is not love as the world knows it, and its the love everyone really desires.

So, let them write and sing and perform whatever they like (Matthew 24:38-39) but for us who believe there are three things:  "faith, hope, and love - and the greatest of these is love".

As for me, my book of choice for conversing with God is Psalms:  150 songs that seem to encompass every human emotion and thought and need.

AMDG