I would much rather write today about the wonders of authentic Christian faith but in the day and age in which we are living in often find it necessary to equip us against the tossing seas of error that threaten the truth (Jude 1:3).
Since homosexual marriage was legalised in the UK in 2013 many in the church have entered into great discussion on the subject, jostling between the direction culture is heading and what the Bible says (don’t be conformed to the pattern of this world but be transformed by the renewal of your mind [Ro 12:2]). Trying to make the church relevant by giving into culture in certain matters will only make it less potent and relevant. Given that I am from Canada, the fourth western nation (after the Netherlands, Belgium and Spain) to make such unions legal in 2005, I have had even more time to reflect on the subject and write today to briefly demonstrate how endorsing homosexuality as a church or Christian crosses the Rubicon.
Firstly, what is the Rubicon? It is a figure of speech, quite similar to the phrase “past the point of no return.” It refers to a river in north-eastern Italy that the general Julius Caesar crossed heading south in 49 B.C. The significance? It was illegal under Roman law for a legion to enter Italy and by crossing he effectively declared war on the Senate and eventually brought about the end of the Roman Republic and the beginning of the Roman Empire. Caesar was intentionally doing something that he knew would have far reaching consequences that could not be [easily] undone. In a nutshell to cross the Rubicon means “to commit oneself irrevocably to a risky or revolutionary course of action.” Endorsing homosexuality is a departure from the “faith once for all delivered to the saints.”

How does endorsing homosexuality cross the Rubicon in ways which other authentic Christians may disagree yet still enjoy varying degrees of fellowship and cooperation? Many Christians disagree over the place of women in ministry, the subject and mode of Baptism, predestination, forms of church government, pacifism/ just war, and divorce.
The answer to the above question is that those are all secondary issues, which whilst very important (and an improper view will produce negative effects on personal and corporate Christian life), are not primary issues. Divorce is an interesting comparison to homosexuality. The reason why it does not cross the Rubicon is because while condemning divorce the Bible does make some exceptions, unlike homosexuality. The greater the theological agreement between Christians the greater the level of missional cooperation (Amos 3:3) and this begins with primary theological matters related to the Gospel (what it means to be saved and know and please God through Jesus Christ). The issue of homosexuality crosses at least three primary lines of Christian beliefs: Scripture, the Gospel, and sexuality.
Rejects the doctrine of Scripture
Central to the Christian faith is that the Lord has spoken light into our darkness by revealing Himself in the Bible. While we must remember context when studying the Bible (literary, theological, historical) the book in question is no ordinary human book but “sacred writings” inspired by God, because “All Scripture is inspired by God and useful…” (2 Tim 3:15–16) and “every word of God proves true” (Prov 30:5).
Therefore Scripture is trustworthy, authoritative and sufficient. Because God is “the same yesterday, today and forever,” (Mal 3:6, Heb 13:8) the truths He has spoken to us remain the same today just as they were 2000 years ago, from eternity past, and into eternity future. If the Bible is from God we listen and obey, if it isn’t we can do what we want, but that is not Christianity.
The problem with endorsing homosexuality is it forces one to crop out significant portions of Scripture as uninspired (under the guise they are culturally bound texts) such as Gen 19; Lev 18:22, 20:10–16; Rom 1:23-27; 1 Cor 6:9; 1 Tim 1:10; Jude 7. The problem is that not only is the cultural argument untenable, but that in dismissing these passages one dismisses a consistent teaching of the Bible that is intricately interrelated to other key texts and teachings of the Bible. To affirm homosexuality is to dismiss Scripture, including Gospel passages.
Rejects the Gospel
The Gospel message begins with the bad news of sin and ends with the good news of forgiveness from sin through faith in Jesus Christ and [eternal] life in His name. To reject homosexuality as sin is also to reject the Gospel. In 1 Cor 6 (cited above) verse 11 reminds the Corinthian believers that “such were some of you. But you were washed, you were sanctified, you were justified in the name of the Lord Jesus Christ and by the Spirit of our God.” When we know we fall short of God’s perfect standard (Mt 5:48) and that faith in Jesus offers us not only forgiveness but the power to change, that is good news in light of our present circumstances. Homosexuality, similar to other sins, separates us from God. The good news is that—whatever our sin(s) or past— we can be restored to God through faith and repentance in Christ and transformed by His Spirit into new creations (2 Cor 5:17). If sin is not sin and the Gospel does not have the power to change it is not a message of good news.
Rejects God’s design for marriage, sexuality and gender
To endorse homosexuality is not simply a different Christian view on human sexuality, it is an entirely different worldview. All Christian teaching on marriage, sexuality and gender (including Jesus and Paul) trace their roots to Gen 1:26–28 and 2:22–24. This is further filtered through the lens of God’s moral standard in the Law such that when in the NT Jesus and Paul quote Genesis and the Law they are showing continuity and agreement with God’s original design consistent throughout Scripture. When Jesus warns the “sexually immoral” that includes homosexuality because it is a stock phrase used by Jesus to refer to the moral standard for sexuality expressed in the Law.
People can dismiss what the Bible clearly teaches on the subject, they are free in matters of conscience to do that, however, it is misguided to say the Biblical worldview for marriage, sexuality and gender is in anyway compatible with those views that endorse homosexuality.
Many objections have and will be made to similar lines of thought as those presented here. I would refer such people to 2 Tim 4:1–5. If we degrade Christ (His Word, Gospel and designs), He will surely degrade us. Recent studies show that generally those churches that remain true to orthodox Christian teachings (such as marriage and sexuality) grow, whilst those who go ahead of such teachings (2 John 1:9) are in general state of decline. Unlike many divisive issues within the church in the past this issue is a Rubicon that will separate the wheat from the chaff. Many churches and individuals have already or are considering crossing the Rubicon. To the former I would exhort you with the aforementioned words, to the latter I would say the following. While Caesar crossed the point of no return, whilst endorsing homosexuality does depart from orthodox Christianity, unlike the Rubicon, through repentance in Jesus Christ, a turning back to Him, restoration is graciously possible.
The Lord’s Sweetest Blessings,
Pastor Chris