I cannot in clean conscience engage against religious supremacism and exclusion if I engage in ideological supremacism and exclusion.Sure you can.
For the most part it is impossible to tell whether belief in God A or God B or God Ba has more merit.
However, one can measure the results of one ideology over another. Capitalism vs. Communism for instance. Or Self Government vs. Despotism.
Modern man has advanced through differentiation. You know reason. Occam's Razor and all that. We have rules for judging differences. In size. In weight. Even in opinion.
I'd hate to give all that up just so you can feel good about giving up religious supremacism.
Cross Posted at Power and Control and at Classical Values