Unfortunately, it’s not entirely true. We have plenty of religious conservatives who are more than willing to engage in character assassination against fellow conservatives who largely agree with them, rather than using that energy against the progressives you mention. A name that comes immediately to mind is Dr. James Dobson.
Bad enough that we have to fight with the “progressives” (who seek only to retard human progress), but to have to deal with back-shooters like Dobson, or religious pseuo-conservatives like Huckabee is abominable. It would be far better to save one’s rhetorical ammunition for REAL foes, than to attack your natural allies (like economic or defense conservatives that may not agree with your religious beliefs)
No man can serve two masters.