Perhaps it was something as simple as the construction worker who caused the first fire wanting to deflect blame from himself? Could he/she have driven to all the churches afterwards and started fires?
Your's is an extremely simple question.
After bruising my lower jaw on my keyboard after reading your absolutely INCREDIBLE post.....I will tell you this axiom: if such a scenario were indeed "fact", it would not BE "simple". It would be worthy of serious criminal profiling on an equal level with most of the hypotheses presented on this thread (all of which overlap your own theory).
Yes--evil is often simple. ..my first thought is a firebug, and firebugs like churches. But Southern Baptist churches? It speaks to an agenda. And six at once? Someone wants attn.