Is a person who reads and believes the NIV a Christian?
A Christian believes in Christ and in His teachings. You should know at least this. You probaly do and are only using another tactic to argue.
There are some who feel some versions are better than others. Personally, I like the KJV. I also have an NLT. The difference being that there are pieces-parts missing from the NLT version that are in the KJV, so perhaps some versions ARE better.