A History of Christianity: The First Three Thousand Years by Diarmaid MacCulloch is a superb magnum opus written from an independent academic perspective. Prof. MacCulloch is Professor of the History of the Church in the University of Oxford. He also wrote a superb book, ‘Reformation’, on the theological and political schisms of the 1500s (though the Reformation is also covered in his larger work).
If you want books that just give a Catholic perspective then these aren’t books to read. If you want books that explore the different theological and political perspectives with academic rigor, from perhaps the world’s leading Church historian, then these are just the ticket.
God bless +
Michael