Islam was founded by Mohammad, who was born in 579CE in the city of Mecca, which was at that time the central city of the Arabian Peninusla. It is through Kedar, second son of Ishmael that Muslim genealogists trace the ancestry of Mohammed.
Good for you for taking the time to ask. You'll find this board to be pretty responsive to people so if you have other questions, throw them out there. Main Beach in Laguna is not a difficult beach for swimming. It is a shallow breaking beach with little or no surfing. There are numerous other coves along the shore line that that are swimable depending upon your ability level. Some have surfing around them, some don't.
Now you can swim in it, you can fish in it, you can sail in it but you can't drink it, you can't water your lawns with it, you can't irrigate an orange grove with it. Remember we live next door to the ocean but we also live on the edge of the desert. Los Angeles is a desert community.