I dislike making lite of religion mine yours anyone's that said . you can go to Universal Life Church - Become a Minister Online
get ordained and simply tell them its a church bus .
The rules about churches are mostly vague the IRS actually puts it in writing in there publication about section 501 C3 that you are not required to apply to be considered a church for tax purposes but its a good idea if " your taking donations " .
Many locale and state laws are not applicable to a religious group . They also use the IRS standard to determine what is or is not a church .
You probably could keep the yellow if wanted as long as you make sure to post max passenger number under 15 I believe is the point between a commercial bus and non for drivers lic.
Myself have been ordained since 1988 . I also understand the cop thing worked as a firefighter / paramedic and on my days off dispatcher many officers are just there to do a job and help . but you have far to many that put that badge an gun on and feel they are right and the civilians need to follow every order immediately to many laws are written n such a sloppy manner that they can be interpreted to mean what ever someone wants them to be .