Is the KJV the true Bible        NO!    

Is the KJV the only Bible?          NO!

Is the KJV the best translation     NO!

If the answer to these questions are an emphatic NO, then why use it?  There is one very simple reason.  The vast majority of ALL major noted and used study books and commentaries for the Bible only used the KJV as their starting point. 

People tend to forget that the oldest of the "recent translations" where not done until the 1900's, whereas the Strong's Exhaustive concordance was first published in  the late 1800's with Matthew Hennery's Commentaries dating all the way back to the 1700's.    

It wasn't until 1901 that we had the oldest of the most recent publications with "The American Standard version published"  Then my favorite, which is "The New American Standard Version"  came out in 1971, but the New Testament only was published earlier in19611.  During my theological education in the late 19860's and through the 1970's¹, this was the "preferred translation for my Greek classes; Greek I, II, and III,  during those years.  FYI: I was the first student to graduate from Evangel University with a Greek Minor in thee Greek language.    I pursed my a Masters at OU built due to circumstances, I as never able to complete my course of study. 

This is commonly e\why the KJV is used for study..

1Wikipedia; The Free Encyclopedia, The Timeline if the Bible