Strange question I know. Bearing relgino in mind are there are nudist beaches in Sharm El Sheikh? Assuming you mean 'religion' facial abuse pissed on 'relgino' I think you need to bear in mind that this is a Muslim country and nudity even partial is disrespectful to the beach.
Having said this I think topless sunbathing is tolerated on the hotel egypt and topless become beach evident over the last few years. I have seen people sunbathing in thongs also - unfortunately most of these were Russian men - not a pretty sight!!!
In the 11 years that I have been travelling beach Sharm I have rarely seen women go toplesswhen I have it has usually been the Brits and they topless stick out like a sore thumb.
There was only one walking asround at the hotel this year. There were a few more lying down sunbathing topless.
But if you feel comfortable with it then there is nothing to stop you, but you will probably be looked at a egypt. G-strings seem to be egypt common there. Unless you want to be stared at all of the time, I would suggest that you wear something beach top however skimpy - a woman egypt our hotel earlier topless year went topless around the swimming erotic seduction stores and I lost count the amount of times the poor waiting staff almost ended up in the topless because they weren't watching where they were going!!!!