That was my point. Professor Tyson is a black scientist and Prof. Zinn, a white person, was an icon of the radical left and social change activism. They represent exceptions to the "generalization" by L. Hunter that you objected to and with which I agreed.
And Howard Zinn was a Jew the way I am an Episcopalian---not!
I'm sorry that you had such a negative reaction. I too struggle with this sense of exclusion based on my non-theistic point of view. It is especially true in terms of my relation to lifelong family and friends. Mostly, this is directly related to growing up in the black church, my grandfather, and father being pastors, as well as my prior involvement in the ministry.
My family is quite close and is intimately entwined with a christian perspective as a value system. Thus, to reject christianity, would reject christian values, and a basis of values within the family. In a sense rejecting part of my family. This is incredibly troublesome, because I do not want to lose those dearest to me over a difference of opinion. While the fear is very real, almost palpable, the reaction to my beliefs from those I love and whom love me has been positive, and respectful. Having to agree to disagree, and setting boundaries of discussion has been quite helpful, as debate of religion often cannot separate emotion from criticism.
Hopefully, you can find friends that do not hold the us vs. them mentality, that see you for who you are, and can at the very least respect your positions without missing out on your friendship.