You realize, of course, that the reason why school boards cannot allow Christian students to write about, mention, or otherwise practice their Faith is because the "public" wouldn't be able to distinguish between school boards making policy and Congress writing laws ... but it is apparently OK for school boards to make policy which is forbidden by the Constitution.
The part in italics is incorrect. Just so you know.
That is separate from the topic of this thread, in which a school obviously overstepped their bounds, UNLESS the boys really were shooting at people waiting for the bus. (Even then, I'd say they overstepped their bounds, but at least there would be a justification for it. Not a good one, but at least something. Their decision regarding it was beyond stupid, however.)
Since the bus stop was 70 yards away, it seems unlikely that the boys could have hit them from the yard, and the school is simply making up stuff to try to cover themselves.