At the core of all of what we recognize as apostate christianity in our time is something really no different than the liberalism that was fought by the theologians in the late 19th Century, such as Charles Spurgeon, and those in the early 20th Century, such as J. Gresham Machen.
Over the last few days on Facebook, for instance, I have witnessed posts showing people holding up signs in front of them professing that they are Christians, but then thanking God for abortionists. In other cases, there are pretty much the same “so-called Christian” groups abandoning everything doctrinally that would line them up with Christian orthodoxy, including the inerrancy of the Bible and its authority. Since they have abandoned the authority of the Bible, they have also rejected all orthodox doctrines that are offensive to secularism.
Of course, ever since our Lord ascended into heaven, the Church has been under attack by wolves. There has never been a time in its history when it was perfect. There have always been false teachers teaching false doctrine to false professors.
In the early part of the 20th Century, J. Gresham Machen was embroiled in a very severe attack on orthodoxy by determined liberals attempting to take over the Presbyterian Church, USA. It seemed like he was contending alone but, of course, he was not alone – he had the Holy Spirit, and those whom God drew to listen, believe, and come from the darkness of compromise to follow Dr. Machen into continued obedient Christian orthodoxy.