Consider this notion in relation to the following:
Evolution or Creation in six literal days
Psychology or the sufficiency of Scripture alone (5 Solas)
Free will or total depravity (enslavement to sin) (TULIP)
Sodomy dna or God's curse of an unrepentant heart (spiritual)
Annihilationism or eternal destruction
Temporary life or eternal life
Hypothetical (potential) atonement or actual atonement
Partial or defective gospel or complete and perfect Gospel
Justification by works or justification by faith alone
Spiritual harlotry or spiritual fidelity
Pragmatism or biblical
Women teaching men or men only teaching mixed company
Immodesty or modesty
Amillenniallism or pre-tribulation Rapture and Millennial kingdom of Jesus Christ
The problem is that either one side is biblical or it is not. If you believe that one side is biblical, then any deviation is anti-biblical and therefore sin.
It is that simple.
2Th 2:10 and with all wicked deception for those who are perishing, because they refused to love the truth and so be saved.