I suspect evangelicals and fundamentalists will stay home.
Trump is not an ideological conservative (if he is a conservative at all) and they are.
Trump is showing signs of ditching everything that Paul Ryan and the militant ideologue/Tea Party wing stands for, including opposition to abortion and the savaging of social security and Medicare. He has recently made noises about raising the minimum wage and raising taxes for the wealthy and has said he has the right to change his mind on issues. He could appoint literally anyone to the Supreme Court. He knows evangelicals (who tend to like Ryan, et al) will not vote for Clinton anyway so losing them won't hurt him if he can pick up votes elsewhere, which he knows he can do because he has done it in the primaries. He also knows there are women out there who are not wild about Clinton.
My guess is he will throw any smidgeon of ideological conservatism he may have under the bus in favour of courting the women's vote, which is by no means cornered by Clinton. This means middle class 'soccer mom' type women as well as blue collar women.
Imo he will not come out against abortion again (he did so very clumsily early in the primaries) and unless public opinion on abortion shifts to greatly oppose it, he will flow with the tide. This will keep evangelicals home. They are issue voters and opposition to abortion is one thing that has made Republican candidates attractive to them even though most of the Republican candidates apart from Rick Santorum are far to the left of their ideal. They don't care about Mammon as much as evolution taught in schools, gay marriage, etc. This was one of the things that turned them off Romney -- he came across as lukewarm on these issues.
It won't matter if evangelicals vote for a libertarian or anyone else -- as long as they don't vote for Hillary Clinton (and I think many of them won't) they are effectively just noises offstage. Trump's ideas on foreign policy eat into libertarian land, so he may even appeal to more cerebral libertarians (who can pick out various foreign countries on a globe).
He seems to have more appeal for people who are wishy washy as far as religion goes, but who are generally poor, hacked off and strident -- his values are very secular and his appeal is to folks who are also largely secular. Ryan apologised a while back for calling vast swathes of American voters 'takers', probably too late. Ryan's remark came in the wake of Mitt Romney's terrible 47% foot in mouth incident a few years before. Both soundbites insulted millions of Americans who probably rightly saw in them the appalling hubris of the rich (and not very compassionate when it all boiled down). I suspect very much that many Trump voters have not voted before and might have voted for him if he had been a Democrat too and they could register as such.
He is much more of an anti-gun control Republican than one aligned with any other issue conservatives tend to come out to vote on. People who are opposed to gun control are not necessarily evangelicals, or even Republicans in some parts of the US. There are lots of people in blue states who hunt and own guns and for whom shooting is a part of life and they may not have enjoyed being cast as enemy number one by the gun control lobby (after all, everyone knows it's only the criminals who own guns who create the gun related problems besetting America). He is also very much wrapped in the flag. Hyped up patriotism comes in all shapes and sizes. The anti-immigrant stance is going to attract many union votes that the Democrats can usually depend on, and union votes are well organised and disciplined.
I think in November there will be several dogfights, and unlikely swing states will emerge. These will be states where Cruz won by large margins -- Utah, Idaho, Wyoming, where (usually Mormon) Republicans see themselves as what George W. Bush called 'compassionate conservatives'. Trump's brand is the opposite of this. Certainly there will be many voters in Texas who won't feel they owe Trump anything. Wisconsin is the home of Scott Walker and Paul Ryan. Any state where libertarians tend to be strong seems to be anti-Trump. All the states that Cruz won will be most interesting to watch in November even if the GOP rallies around Trump, and that is not a given because in the long run they need to hold onto the evangelical base that Trump may not appeal to.
Then there will be swing states like Ohio, Florida, Virginia, Colorado, Nevada, New Hampshire and Iowa. Iowa will probably go to Clinton (Trump lost there in the primary). New Hampshire may go to Trump despite being the home of Sanders. It will be a bitter battle. Virginia may go to Clinton especially if she picks Missouri native and Virginia Senator Tim Kaine as her VP. Ohio may go to Trump lots of disaffected voters there. Florida is Jeb Bush land and also has a high hispanic population so it may well go to Clinton. Nevada and Colorado are probably Trump territory immigration and gun control may prove to be galvanising issues.
Evangelicals who may have voted for Trump in South Carolina may have been attracted to his anti-Muslim and strong national defence position. SC is one of those states with high levels of enlistment in the armed forces at enlisted (Pfc) level. The only issue Trump holds dear to his heart that might attract evangelicals is patriotic/anti-Muslim policies. This may have attracted some.
But evangelicals are the kind of people who see events in apocalyptic terms and maybe they will let history write itself and await the resulting smiting with fortitude. Trump won just about one third of the vote so the other two thirds who voted in SC opted for someone else. His support may or may not have come from evangelicals. It may well have been a factor that SC allows all registered voters to participate in the primary, and you don't have to declare any party affiliation to get a party ballot. Overall I don't think you can say that 'evangelicals supported Trump in SC'