The bible is where we find the answer for what makes us a Christian.
Now, some will argue that it is faith in Christ that makes us a Christian. True, but let us consider the following:
Where did we get that idea and what makes us believe it is correct? The bible
How do we know who Christ is apart from the bible? Is there a separate Christ from the bible? The bible actually calls Jesus the Word. There is definitive unity between Christ and the bible.
Faith and the bible are inseparable. There is always an object of faith. When we speak of having faith, we speak of having faith in something or someone. Faith in Christ means a faith in the Christ of the bible.
Christ himself validated the scripture by His own words. This Christ that someone says they believe in is the Christ of the bible – by His own admission.
Followers of Christ cannot be selective in what parts they believe and what parts they live. By its own witness and by the witness of Christ Himself the Bible is true. Instead of following the bible based on the filter of our opinions and worldview we should allow the bible to form our opinions and worldview.