The Roman Catholic Church is one which started the fight more publicly when It announced that it was only righteous church of Jesus on the earth that it owns the keys of redemption ,well the Egyptian Orthodox Church had to fire back
Pope Shounda is building his assumption on the fact that there is nothing in the Bible says that Saint Peter went to Rome , but on the other hand the Catholics say also the other 11 apostles were not mentioned either in the Bible so why the Pope of Alexandria puts ST.Peter in his mind ??
And that on the same way there was no proof that St.Mark did not come to Egypt either !! of course the Catholics did not leave the opportunity without underestimating St.Mark
As you see this is just another theological war between the Coptic Orthodox church and the Roman Catholic Church and to be honest Pope Benedict was the one who put more fuel on the differences between them