When you say adaptable and flexible what does it mean? They ignore the parts they don't like?
e.g. how do Jews conciliate atheism with Judaism? Or homosexuality?
Don't these break primary laws in Judaism?
Most Jews aren't fundamentalist or orthodox. They know that words can be interpreted in many ways. Debate about the meaning of the words is not discouraged, it is encouraged. There is no hell, your fate is between you and your God. Belief in God is probably the only real requirement.