Who is a Christian?

What is the definition of a Christian according to the dictionary and according to God? Is morality or kindness the key to being a Christian? How does being a true Christian mean to be 'in the Anointed One'? Even though the word Trinity is not found in Scripture how is the Truth of the term found in Scripture? Why did God the Father give His chosen ones to His Christ? How is it that God can remain just and still forgive sinners? How did the finished work of the LORD Jesus Christ fulfill all the requirements of a just God? How do we see that being a true Christian has everything to do with what the LORD did in Christ? How is God the source of a Christian's Faith?