to the GOP becoming very religious-oriented
It is already.
There are plenty of intelligent Conservatives, who could be trained to represent us. It is not hopeless. But the pursuit is being hampered by the inside the "Beltway" mentality, which is terrified by any fresh approach, which might break people out of the neat little ideological boxes, that the established "brain trusts" (not to be confused with actually intelligent people) in each party, feel they understand and can control.