I have personal experience with these "churches" after my time in Portland. They were far and away worse than the homeless. They will harass and abuse you on the street ESPECIALLY if you dare express cynicism towards their spiel.
They will follow you, and verbally abuse you unless you bee-line straight for a police station too.
Why these charlatans are able to masquerade as a religion I'll never know....
I had an encounter back in 2008 at their old Lincoln Ave location. I told them something to the effect of "Nah: if I'm going to join a UFO cult I'll find a cheaper, more fun one."