Adhering to Scripture...I do think they know what that means...
Here is something very important that the modern church for the most part ignores:
But now I have written unto you not to keep company, if any man that is called a brother be a fornicator, or covetous, or an idolater, or a railer, or a drunkard, or an extortioner; with such an one no not to eat. 1 Corinthians 5:11
The church today would have many empty seats and offering plates if scriptures such as this were honored and followed as they should be.
Instead, they teach that one can go on in sin and still be saved based on justification without sanctification. You must have both.
Know ye not that the unrighteous shall not inherit the kingdom of God? Be not deceived: neither fornicators, nor idolaters, nor adulterers, nor effeminate, nor abusers of themselves with mankind,  Nor thieves, nor covetous, nor drunkards, nor revilers, nor extortioners, shall inherit the kingdom of God. And such were some of you: but ye are washed, but ye are sanctified, but ye are justified in the name of the Lord Jesus, and by the Spirit of our God. 1 Corinthians 6:9-11
There are plenty of scriptures that further support this.
The adversary hath spread out his hand upon all her pleasant things: for she hath seen that the heathen entered into her sanctuary, whom thou didst command that they should not enter into thy congregation. Lamentations 1:10
And have no fellowship with the unfruitful works of darkness, but rather reprove them. Ephesians 5:11
But I say, that the things which the Gentiles sacrifice, they sacrifice to devils, and not to God: and I would not that ye should have fellowship with devils. Ye cannot drink the cup of the Lord, and the cup of devils: ye cannot be partakers of the Lord's table, and of the table of devils. 1 Corinthians 10:20-21
Be ye not unequally yoked together with unbelievers: for what fellowship hath righteousness with unrighteousness? and what communion hath light with darkness? And what concord hath Christ with Belial? or what part hath he that believeth with an infidel? And what agreement hath the temple of God with idols? for ye are the temple of the living God; as God hath said, I will dwell in them, and walk in them; and I will be their God, and they shall be my people. Wherefore come out from among them, and be ye separate, saith the Lord, and touch not the unclean thing; and I will receive you, And will be a Father unto you, and ye shall be my sons and daughters, saith the Lord Almighty. 2 Corinthians 6:14-18
The people in church today are really excited that they are justified and they are not really concerned at all about being sanctified.It shows in the rampant compromise and sin within the church. Thus they have no problem with allowing fellowship to include habitual sinners, those who continue on in their sins.
There is a saying thrown around within the modern church where they excitedly say "I am justified, just if I'd never sinned".
First we need to define the terms. I have pulled the definitions out of Webster's 1828 dictionary.
Justify - In theology, to pardon and clear from guilt; to absolve or acquit from guilt and merited punishment, and to accept as righteous on account of the merits of the Savior, or by the application of Christ's atonement to the offender.
Sanctify - In a general sense, to cleanse, purify or make holy. To cleanse from corruption; to purify from sin; to make holy be detaching the affections from the world and its defilements, and exalting them to a supreme love to God.
Many today rest their case on justification alone but their case fails due to lack of living a life of sanctification.
In other words, they say they are saved but their lives demonstrate otherwise. They fail to bring forth fruits meet for repentance as John said in the wilderness (Matthew 3:8). Their works demonstrate a dead faith rather than a faith that is alive as James wrote in the second chapter of his epistle.
Sanctification is not just a one time thing. It is done through every moment of one's life so that they can always be ready on the Lord's behalf.
Today's modern doctrine of "preservation of the saints" or "once saved always saved" (OSAS) teach essentially that it is a one time thing yet the Bible says otherwise.
But and if ye suffer for righteousness' sake, happy are ye: and be not afraid of their terror, neither be troubled; But sanctify the Lord God in your hearts: and beready always to give an answer to every man that asketh you a reason of the hope that is in you with meekness and fear: Having a good conscience; that, whereas they speak evil of you, as of evildoers, they may be ashamed that falsely accuse your good conversation in Christ. For it is better, if the will of God be so, that ye suffer for well doing, than for evil doing. 1 Peter 3:14-17
People reject the notion of Good Works as being essential within the covenant of God regarding salvation. In doing so they leave open the door for sin and the justification of it. Instead we are told to live by faith.
For therein is the righteousness of God revealed from faith to faith: as it is written, The just shall live by faith. Romans 1:17
This is not saying that we shall live by sin but instead it is living a life of daily faith or sanctification if you will. A huge part of this is obeying Jesus and His Word. Jesus said "For therein is the righteousness of God revealed from faith to faith: as it is written, The just shall live by faith" and "If ye keep my commandments, ye shall abide in my love; even as I have kept my Father's commandments, and abide in his love."