I'm at a bit of a frustrating impasse in my current game as the Persians at Noble difficulty. I've founded Islam, and with the recent acquisition of the Vassalage civic, I'm ready for a little Jihad against my heathen Taoist neighbors. Yet I find I can't even give them the opportunity to accept the true faith before I sweep through their lands with steel and fire. In the diplomacy screen, there are no options under "Convert." What gives? I also don't seem able to attempt any persuasion when it comes to their civics either. The booklet and civilopedia are both inexplicably silent on this issue, so hopefully someone here can edumucate me.