Test All Things- Just because someone says they are a Christian, goes to church, or recites Bible Scriptures does not necessarily mean they are, in fact, a Christian.
Though, Christians are fallible, get angry, and make mistakes and bad decisions, at times, it still stands true that we can know a true Christian by the integrity of the fruit they bear, on an ongoing, overall basis.
Do not be afraid to tread lightly, and test the waters of each so-called Christian’s actions before trusting that they are, indeed, a disciple of Christ.
1 Thessalonians 5:21-22
Test all things, and hold firmly that which is good. Abstain from every form of evil.