The more general, and I think by far the more important questions are: What makes someone a Christian? And is Christianity itself to be defined by how Christians themselves behave? Or is it to be defined by how they ought to behave according to some source or authority such as a tradition, the Bible, their clergy, the majority of self-identifying Christians, etc.?
What make someone a Christian? Basically, one who has given their lives to Jesus Christ and committed their lives to make Him Lord as they believed in the resurrection.
Is Christianity itself defined by how Christians themselves behave? Normally people do judge by what they see and act. However, technically, Christianity should be defined, not on how Christians behave, but rather on what the message Jesus gave.
There are different types of Christians:
There are children Christians (who don't know how to act - and mature Christians that do) -- Hebrews 5:12 For though by this time you ought to be teachers, you need someone to teach you again the basic principles of the oracles of God. You need milk, not solid food, 13 for everyone who lives on milk is unskilled in the word of righteousness, since he is a child. 14 But solid food is for the mature, for those who have their powers of discernment trained by constant practice to distinguish good from evil.
There are children, young men and fathers - 1 John 2:12 - I am writing to you, little children, because your sins are forgiven for his name's sake. 13 I am writing to you, fathers, because you know him who is from the beginning. I am writing to you, young men,
There are Christians who act like they are not Christians or as babies who poop and smell like it:1 For 3:1 And I, brethren, could not speak unto you as unto spiritual, but as unto carnal, even as unto babes in Christ. 2 I have fed you with milk, and not with meat: for hitherto ye were not able to bear it, neither yet now are ye able.3 For ye are yet carnal: for whereas there is among you envying, and strife, and divisions, are ye not carnal, and walk as men?
And then, of course, there are those who say they are Christians, work among Christians, and has an outward appearance of a Christian... but aren't Christians. Matthew 7:15 - Beware of false prophets, which come to you in sheep's clothing, but inwardly they are ravening wolves.
So approach each one as required