The pagan Renaissance is no more. A hundred years of interpretation of Burckhardt's thesis has erased most traces of those fearless individuals whose fascination with the almost living statuary of antiquity, whose reckless disregard for Christian symbols, whose awe before the figures of Scipios and Catos had brought them to despise the theological and abnegatory world which had mothered them. Renaissance man remained a Christian, even a pious one. The shapes of the world and its art might be in transition, but the cosmology of its inhabitants remained Christian.
What exactly is meant by: ‘This remained a Christian age’? I think the idea is that Christian dogmas and beliefs remained essentially unaltered: first, the authority of the church to define doctrine was unquestioned; second, the leading figures of the age were generally traditionally Christian in their attitudes, neither better nor worse, perhaps, than previous generations.