Hi, I've been thinking of the idea of moving to Spain and I have minor children who I'd like to go to english speaking schools in Spain. They are in the Ages of 5 - 16yrs. I myself think that as a Roman Catholic there should be more choices.Can anyone give me some advice as to the places? So far I'm of seville and Marbella.

Maybe you should first of all investigate where the best place to find work or start a business is? It sounds as though you are looking for a Med city. Barcelona is obviously very cosmopolitan, but don't rule out Valencia or Alicante. All are cosmopolitan (to a small degree) and I'm sure you'll be able to find English-speakers to network with.
If you decide to bite the bullet and go to Madrid (where more work opportunities are - relatively speaking) I would recommend living in central Madrid. My experience is that people living in say Malasana or Moncloa areas are more open-minded and less anti-immigrant than say Pozuelo or Somosagauas. Of course you then don't get the benefits of living close to countryside...