If ANYONE tells you the NIV is a good Bible to use, they are either a wolf in sheep's clothing or completely deceived. DO NOT USE THIS CORRUPTED FILTH. This book takes a title for JESUS and assigns it to lucifer. This is all you need to know that this entire book was carefully edited to lead people astray. They also remove verses about fasting. I've also included here that the catholic bible has also made the same evil revision to God's Word. I guarantee you'll never see a KJV in a catholic church, or most modern churches today.
Notice that Matthew 17:21 is MISSING from the NIV. The verse about prayer and fasting giving us believers the ability to move mountains. You can see in Revelation how God feels about his Word being added to or removed.