And what old fear-based doctrines would those be? Please be much more specific in the details of the specific doctrines you are referring to.
I hope the doctrines you oppose are not the the ones that held the immoral left in check for almost four hundred years in this country?
The reckless immorality of the nineteen sixties is not something to be proud of.
That movement was not a Republican movement, it certainly was not a consertive movement and it stood in opposition to the entire history of the American law, morality and culture.
A combination of an artificially godless, Big-Government public school monopoly, fifty years of secular leftist news media and fifty years of filth from the leftist entertainment industry have worked in combination to condition our culture into the irresponsibility and immorality revolution you see today. The same destructive anti-American garbage launched by the pro-filth leftists in the nineteen sixties has eaten at the heart of our country like a cancer. As government has gotten larger and larger, the courts have been used by the left to create the new immoral culture, replacing the one American's loved and the reprobates hated.
A few big ones:
Original Sin: The ultimate Big Religion con game. No one can ever feel any sense of self-worth ...and must pay an intermediary to intercede on their behalf.
Eternal Damnation: The wildly disproportionate penalty applied to any human activity which threatened to slow down the the intermediaries' cash flow.
The Wrathful God: A projection of the human ego, the elevation of a stern and merciless father figure to back up the intermediaries' demands for land and gold.
These aren't the doctrines of any legitimate religious faith - they are what results when humans rewrite religious texts for two thousand years to suit their own purposes. Tools to scare the flock into submission, and cow the upstarts.
Islam's additional and more extreme doctrines of jihad and suicide attacks in Allah's name push its subjects too far, and end up hurting the imams economically - which is one of the primary reasons why Rome became rich, while Mecca (until the relatively recent Gulf oil boom) remained disorganized and dirt poor.
The 1960's were a gross overreaction to these doctrines - as so often happens, the pendulum swung too far in the other direction. The doctrines were a rather brutal but fairly efficient way of making dumb people behave themselves - once they were removed those people were lost, and Great Society liberalism poured gasoline on the flames.
Regardless, the younger generation with tremendous volumes of information at their fingertips aren't going to adopt religious conservative beliefs in any significant numbers. When they encounter these doctrines for the first time, they are going to fall down laughing.
Republicans who choose to represent the demographic who believes in these doctrines at the expense of those who do not might achieve a pretty good political result today, depending on their districts. But their political futures look very bleak. These types of Republicans come across to the younger generation as backward-looking, anti-technological, witch-burning fearmongers, and that allows total idiot Democrats who are at least awake enough to pay lip service to the Internet generation's priorities to keep winnning elections they have no business even being competitive in. Cantwell, Murray, and Boxer spring to mind - these dim bulbs were actually considered the smart candidates in their last races.