The fact is that America is no longer a conservative country. For example, for the first time in history there are more "nones" (people with no religious affiliation) than any other voting block. That statistic is never going to go back down, ever. That's clearly not the sign of a conservative country.
I'm not sure that this is the best metric of a "conservative country," but where do you get this data from??
Here's the history of Gallup polls on religion for example. According to them, in 2015, 38% of people identified as Protestant, 23% as Catholic, 9% as other Christian... that's 60% Christian right there. The "None" only accounted for a measly 17%. Pew polls put the number more at 70% Christian in 2014, with only 23% unaffiliated.
Moreover, when you start looking down that Gallup Poll list, you find stuff like, "Do you believe in God?" 1944 - 96%, 2016 - 89%. A downtick for sure, but hardly the sign of lack of religious belief.
"Do you believe in heaven?" 1968 - 85%, 2011 - 85%
Hell - 1968 - 66%, 2011 - 75%
Belief in angels is still up there in 2016 at 72%, which is a little lower than it was in the early 2000s, but about the same as it was back in the 1970s.
And heck, 73% of Americans believe in the virgin birth of Jesus, including about 1/3 of your "unaffiliated" no-religion group.
Now, there are other polls that put the numbers a little lower. The Harris Poll for example only puts belief in the virgin birth at 57%, with 68% saying he is the Son of God.
Religious belief and attendance is down more than ever before in history. There are fewer churches and places of worship in this country than ever before in history. Religion is dying off here, both figuratively and literally.
Is church attendance down? Yes. And the percentage of folks who say religion is "very important" in their lives is down (though still the MAJORITY of Americans, according to polls). But given that the majority of Americans still seem to strongly subscribe to religious beliefs, including significant numbers of your "unaffiliated" folks, I'd hardly say it's "dying off" yet.
I have absolutely no idea where you get your idea that there are more "nones" than any other voting block. It may be true that the majority of Americans no longer attend church every week, but it's still a highly religious country.
the fact is that America is slowly but steadily moving towards more liberal social and political systems, not away from them. It's been doing this since the late 50's, but has sped up a bit considerably the last decade or so.
I agree with this, though to go back to your previous point -- the number of people identifying as "Evangelical Christians" has been fairly constant over the past few decades. It hasn't even declined as much as the other general religion numbers. So... it's not like the true "conservatives" (in terms of religion) are going away... it's more like the people in the middle are becoming less concerned about religious values holding sway over their lives. But there's still a rather huge contingent of people with far right values (certainly larger than your "none" contingent), and that block isn't going away anytime soon.
Pot is now fully legal for recreational use in multiple states with more coming (count on it). That's not the sign of a conservative country.
We MIGHT just be getting back to the level of acceptance of recreational/medicinal drug use enjoyed in the 1900-1930 era or so. If that's "liberal" and "progressive" to you... well, gosh, that's great!