If you do not wish to see RF posts, do NOT use the "everything" option on the browse. Instead, browse by "News/Activism." When you log back in, the browse will reset to "everything" - so be sure to set it back to "News/Activism."
If one wants to engage in pure polemic religious debate there are plenty of pure religion forums for those with that inclination.
My suspicion on the wide majority of religious polemic that gets posted on Free Republic is not that people want to engage in a pursuit of truth...they are mostly recycled ideas...this story is what 3 years old? But rather that people do it fulfill their base desire to slander another religion (and again I will repeat the point that I made in my original post: that Free Republic is not the place for fulfill one's urge to slander another religion).