This needs to be answered. Your friend is not a conservative theologian, in fact by being a Protestant/Catholic he is at minimum schismatic and like many Protestants he appears to be drifting into beliefs that are possible heresy. I do not label any individual a heretic unless they have been so labeled by someone with authority in such matters and I am not a priest or bishop, but biblical literalism and the theory it comes from sola scriptura is a deemed heresy.
Heretical beliefs are never conservative theology.