Which Presbyterian denomination is the apostate one?

I can only speak for the country I live in (which is not America). The national (Presbyterian) church has recently embraced current attitudes and views about homosexuality. Since then, thousands of members of that church denomination have voted with their feet and left, along with 40 ministers so far, to worship with other Presbyterian Christians who likewise stick to the Bible, or to form independent congregations.

I don't think you can really speak of one Presbyterian denomination, however. You will find a creeping acceptance of anti-biblical views in a range of Presbyterian denominations - different ones in different countries, yet not all their members will support apostasy in any shape or form. There is a sifting going on right now - a real spiritual battle - as the devil seeks to corrupt true worship. The book below goes into detail about recent apostasy infiltrating the national Presbyterian church, and how many have left, yet continue to worship within Presbyterian parameters.

There are two main types of apostasy: (1) a falling away from key and true doctrines of the Bible into heretical teachings that proclaim to be “the real” Christian doctrine, and (2) a complete renunciation of the Christian faith, which results in a full abandonment of Christ.

Arius represents the first form of apostasy—a denial of key Christian truths (such as the divinity of Christ) that begins a downhill slide into a full departure from the faith, which is the second form of apostasy. It is important to understand that the second form almost always begins with the first. A heretical belief becomes a heretical teaching that splinters and grows until it pollutes all aspects of a person’s faith, and then the end goal of Satan is accomplished, which is a complete falling away from Christianity.

A recent example of this process is a 2010 study done by prominent atheist Daniel Dennett and Linda LaScola called “Preachers Who Are Not Believers.” Dennett and LaScola’s work chronicles five different preachers who over time were presented with and accepted heretical teachings about Christianity and now have completely fallen away from the faith and are either pantheists or clandestine atheists. One of the most disturbing truths highlighted in the study is that these preachers maintain their position as pastors of Christian churches with their congregations being unaware of their leader’s true spiritual state.

The dangers of apostasy were warned about in the book of Jude, which serves as a handbook for understanding the characteristics of apostates like those chronicled in Dennett and LaScola’s study. Jude’s words are every bit as relevant for us today as they were when he penned them in the first century, so it is important we carefully read and understand them.

I have no experience of Presbyterian churches, although I would agree with Annsan that any denomination that goes against what the Bible says with regard to morality and actively encourages people who are in same-sex relationships to hold positions of authority and teaching has apostassied. I know the Church of Scotland has done this and ministers and members are leaving in their thousands.