I fully agree with the above sentiments. Whilst I do think it is a good idea to show that not 'all' Muslims are bad (counter acting what is arguably the media's agenda), I don't think ANY sort of religious-type advertising should be put onto public transport.
The 'Some people are gay - get over it' adverts that Adrian linked to earlier are good anywhere - while homosexuality may have some sort of cross over with religion there should be a fine line between the two.
I think no matter what you try to do with ethics or philosophy, it's going to upset/offend someone nowadays.
RE: Anything and Everything