What is your Favorite Religious Contradiction?

[Overmars]

I'm always intrigued by the contradictions between the Old and the New Testament, it seems that God changes his "attitude" according to the situation of the Jews, in the times of the Old testament when the Jews are a dominant nation under the great kings such as Solomon and David their god is described as a wrathful, vengeful and a warrior god, when the Israelites conquer new territories they spare nobody, they have a religion of the masters but in the times of the New Testament when they are weakened and conquered by the Romans things change, there are no more longer masters, they are slaves and they adapt their religion according to the new situation, their god suddenly preaches love, compassion, kindness and peace. This is very strange in my opinion.