Dulciana - Not everybody has the same religious convictions as you do. They don't mean anything particularly significant by the use of the term OMG. Not everybody is religious.
I thought the point of this topic is to mention the things that really upset/annoy us or that we would like to see banned? Lots of things are listed here that might be regarded as ok by some!
As for not meaning anything particularly significant by OMG - if you published a picture of Mohammed without meaning anything 'significant' by it, would that make it non-offensive to Muslims?