That is rank relativism. Of course we can know "something...objectively  exists", primarily through Revelation. God is not confined to "particulars", the "contingent", or the "situation[al". There is no such thing as "pre Vatican II concepts" where the topic concerns dogmatic teaching. Dogma, because it is Divinely revealed, does not change because truth does not change. Acts of perversion were mortally sinful in AD 17, 1017, and 2017. No council, pope, or modernist wishful thinking can change that fact. There is but one faith, one baptism, one church.