Can you not believe in god and be a good person?

There is a huge post electoral debate in the US about "moral values". Fundamentalist Christians seem to have taken possesion of everything that is good in human behavior. Lets be very simple here. I will start by defining concepts. The word moral is related to the goodness of a human action, as opposed to immoral which the opposite. A value is a principle, standard or quality considered worthwhile or desirable. So a moral value can be better explained as a principles related to goodness in human actions. Well, if we start there, we can now safely say that being religious, i.e, going to church every Sunday, praying at the dinner table, reading the bible every night does not guarantee goodness in the behavior of human beings. For example, a moral value is truthfulness. We all agree on that. How likely is a religious person to lie compared to a non-religious one?. Another example of moral value is justice. How likely is a religious person to be unfair to someone compared to a non-religious person? I would say that we cannot tell for sure. But what I can tell for sure is that the likelihood of a religious person discriminating a non-religious person is greater than the likelihood of a non-religious individual discriminating a religious one. This would go against the moral value of equality, the one that says that all of us are equal. Someone who does not believe in god, in many cases believes that all people are equal and understands the real meaning of a moral value is. If religious people decide as a group to be more tolerant, then they will embrace the moral value of tolerance and add one to their list. People who do not believe in god, can be good people. Why is that so hard to make people understand?