Is all sin the same? No, when Jesus said that to even so much as look at a woman with lust is adultery, He wasn’t saying that you might as well go ahead and do it. You have to have the sin in your heart and mind before you do it in action, but to add the act adds more sin. See?
There's a difference in degree (seriousness), a difference in progression (how far the sin has gone), and a difference in consequences. All sin has been paid for and all sin is damning, but different sins have different temporal consequences.
People often miss the point about the consequences of sin. The simplistic notion that to make more of a deal over some sins than others is somehow wrong reveals ignorance instead of a more mature understanding of the heinousness of all sin, whatever its kind.
Some sins are worse than others. Yes they are. They are worse in what they do. They wreck you faster and more completely. They damage others more severely. They reach out further and make it harder for you to come back to God. Oh, His hand isn’t so short it cannot save you, but the further you are away, the more it is going to hurt you to get back, that is for sure.
How many people are leaving the door open for the devil? Many, but how many are assigning him a permanent place at the dinner table? It is a different question, and I want to give an example for us to think about.
People are trying to convince themselves that living together, as an unwed couple, is the same as any other sin. Well, it is the same in THAT it is a sin, and it is the same in that it is the same as some OTHER types of sin, but it is NOT the same as any old sin. It has much more disastrous consequences than many people realize or are willing to admit. Staying in sin is much worse than playing with sin. Yes any sin is bad, but inviting it to stay is like inviting the devil to come in through an always-open door.
There is a difference between continuing to make bad choices, falling back and repenting, etc., and having ONE choice to make but refusing to do it, like the difference between someone who is trying to overcome homosexuality and the person who won’t move out of the house from his gay lover, and the person who marches in the gay pride parade, actively promoting it. Homosexuality isn’t the issue with this missive, however, cohabitation is.
Fornication is wrong, of course. However, moving in with and then continuing to live with a sexual partner, as an unmarried couple, is outright rebellion. It is open warfare and it is different. You are leaving the door open for Satan 24/7 while in that state. At least the fornicator who is trying to repent isn’t in that state at all times, they keep making bad choices and letting the devil in. The outright rebel who only needs to make the one choice is always in their state; they always have the devil right there. They are always leaving the light on for Satan to come on in. The person who slips falls into a snare the person who sits is living in one continually and likes it.
There is a difference, a BIG difference between someone who falls into a snare and someone who dwells in the den. The person struggling with sin is leaving God’s table and eating the world’s food. The person who stays in the house of sin is having the devil over for dinner every night, with a permanent place at the table.
Whenever we sin, we are in danger of allowing the devil to get a foothold. If it continues and forms into a habit, that foothold becomes a stronghold. Those that fall into habitual sin are battling against a stronghold that the devil has gotten in their lives, and they keep fortifying it by their sin. That stronghold becomes a fortress. In our scenario, where some live as an unmarried couple, they move into the fortress itself, and they are paying the devil for the mortgage. You might as well put a sign on the front door that says, “welcome to the devil’s place”…