Ignorance is orthogonal to spirituality. By avoiding deeper relationships with people who are religious you are preventing yourself from meeting religious people who will break your preconceptions of religious people being ignorant.

I often describe myself as a devout atheist, and was very outspoken against religion throughout high school and college. For the past 23 years I have been at universities that have strong religious foundations (one a Jesuit institution, one a Franciscan) and I have had extensive opportunities to engage very religious people in frank discussion. Having discussions over scotch about faith, certainty, and atheism with priests who are your colleagues dramatically changes your perspective. My realization that faith and certainty are not correlated in learned religious people changed my perspective. There are lots of things that we do and believe that we cannot fully justify rationally. Most of our moral and religious beliefs fall into that domain. Because it is difficult for us to evaluate the objective truth of those beliefs, we usually utilize a utilitarian or deontological standard of worth: do they make the world a better/worse place or do they hurt/help people? When you deal with intelligent religious people, you find out that many of them examine religious beliefs by the same standards that non-religious people examine their moral beliefs.