Well, from my understanding, being Christian is all about embracing the new testament teachings and perspectives of the Christ. But there are a lot of fundamentalist evangelicals who seem enthralled with the vengeful precepts of the old testament and become quite uncomfortable with the compassion that fills the new testament.
Maybe they're just following the teaching of Jesus.
For example...
[quote="Matthew 5:17-20]
Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfil. For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled.
Whosoever therefore shall break one of these least commandments, and shall teach men so, he shall be called the least in the kingdom of heaven: but whosoever shall do and teach them, the same shall be called great in the kingdom of heaven.
For I say unto you, That except your righteousness shall exceed the righteousness of the scribes and Pharisees, ye shall in no case enter into the kingdom of heaven.[/quote]
Given that the earth is still here, then according to Jesus all the old-laws still apply.
Plus, there are Jesus quotes that seem perfectly in-line with the vengeful nature of the OT.
[quote="Matthew 10:34-38]
Think not that I am come to send peace on earth: I came not to send peace, but a sword.
For I am come to set a man at variance against his father, and the daughter against her mother, and the daughter in law against her mother in law.
And a man's foes shall be they of his own household.
He that loveth father or mother more than me is not worthy of me: and he that loveth son or daughter more than me is not worthy of me. And he that taketh not his cross, and followeth after me, is not worthy of me.[/quote]