I just got done watching that 58 min video and I have got to mention a few things:
Some of the things they say in the video are actually supported by scripture. When they just talk about it they have decent reasoning, but the way they go about "teaching" (AKA with picket signs and yelling) the scripture is not an acceptable form of worship.
I have to wonder what version of the bible they read. I had several things come to mind that would come straight from the bible that tells them what they are doing is flat out wrong. Reasoning from the bible is the only way to prove to these guys what they do is wrong. Also, they have many false ideas. It isn't just limited to carrying out correct ideas in an incorrect way.
That being said, they wouldn't listen to me, they'd listen to "gramps" which IS idolizing as they hold his word over the message of the bible.
And speaking of "gramps", that guy is a coward. He would not answer that reporters' question because he is afraid of getting caught. And when he called that reporter an idiot, that is going directly against scripture and proves he is afraid of being wrong.
"Prophets" of God are supposed to help understanding of the scripture. Anyone reaching out to know truth should have it taught to them, but from the bible, not from some guy that is reaching insanity.
EDIT:
For anyone that is interested...
this proves God did not burn down that church or kill soldiers. Read 1 John 5:19 and for clarification read the description below. Clearly points out the bible says Satan is in control of the world, not God. (I googled "1 john 5:19 king james" and this was the first hit, I do not support this site in any way).
And for people that get hit by cars...
this (at the end... "but time and chance happeneth to them all") explains that we cannot control our misfortunes. It isn't because God hates you that you were ran over.