Why isn't piety and essential part of human goodness?

you can believe in God and still not do right, so believing in God really does not matter to be honest. a good person is a good person no matter if they are Catholic, athiest, or Jewish. the heart of a person, the good nature of a person, the honest of a person, and the purity of one actions is what really counts. a bad or evil person is just that as well. yet, in every good person there lies a bit of anger for if the right person or thing pushes the right on even the best of us lose our temper; we are sorry after words but we still can lose it, we are only human.