One who is sick of denominations of Christianity preaching doctrines that are against the Bible they claim to preach. They are also the ones to practice and follow scriptures such as Ephesians 4:26 that says "In your anger, do not sin". Or, depending on the version of the Bible you are reading, it says "Be angry; sin not!"
Mormon - Can I read to you from the Book of Mormon, another testament of Jesus Christ?
Angry Christian - No you may not read to me from that book. Paul said in the Bible that any man or angel that preaches a Gospel other than the one that has been given you shall be Cursed!
An angry Christian is a person who believes in Jesus Christ, attends church regularly, and has been baptized. He or she also believes in no other good religions, and that Christianity is the best religion ever, and the only "true religion". Most angry Christians are blatantly ignorant, pretty stupid, and look rather scary when they're angry. Waving fiery emblems of Christianity is optional when forcing others to convert.
<angry christian> *waves a burning cross around* JESUS HATES JEWS!! CONVERT THYSELF UNTO THE LORD OR I WILL KILL YOU WITH MY BARE, ENLIGHTENED HANDS!