... It's interesting those who preach (harp on) against adultery are usually the guilty. ...
You have seen how many times that God, through the Holy Prophets, Apostles speak about adultery right? What would your argument say about God then? Sounds an awful like what satan attempts to pin upon Him.
Jesus:
Matthew 5:27 KJB - Ye have heard that it was said by them of old time, Thou shalt not commit adultery:
Matthew 5:28 KJB - But I say unto you, That whosoever looketh on a woman to lust after her hath committed adultery with her already in his heart.
Matthew 5:32 KJB - But I say unto you, That whosoever shall put away his wife, saving for the cause of fornication, causeth her to commit adultery: and whosoever shall marry her that is divorced committeth adultery.
Matthew 19:9 KJB - And I say unto you, Whosoever shall put away his wife, except it be for fornication, and shall marry another, committeth adultery: and whoso marrieth her which is put away doth commit adultery.
Matthew 19:18 KJB - He saith unto him, Which? Jesus said, Thou shalt do no murder, Thou shalt not commit adultery, Thou shalt not steal, Thou shalt not bear false witness,
Mark 10:11 KJB - And he saith unto them, Whosoever shall put away his wife, and marry another, committeth adultery against her.
Mark 10:12 KJB - And if a woman shall put away her husband, and be married to another, she committeth adultery.
Mark 10:19 KJB - Thou knowest the commandments, Do not commit adultery, Do not kill, Do not steal, Do not bear false witness, Defraud not, Honour thy father and mother.
Luke 16:18 KJB - Whosoever putteth away his wife, and marrieth another, committeth adultery: and whosoever marrieth her that is put away from her husband committeth adultery.
Luke 18:20 KJB - Thou knowest the commandments, Do not commit adultery, Do not kill, Do not steal, Do not bear false witness, Honour thy father and thy mother.
Paul:
1 Corinthians 6:9 KJB - 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,
Hebrews 13:4 KJB - Marriage is honourable in all, and the bed undefiled: but whoremongers and adulterers God will judge.
James:
James 4:4 KJB - Ye adulterers and adulteresses, know ye not that the friendship of the world is enmity with God? whosoever therefore will be a friend of the world is the enemy of God.
See Moses, Isaiah, Jeremiah, Malachi, etc.
Also, pointing to bad apples that separate themselves from the good tree, has nothing to say about the good apples, nor of the good tree.
A person who attempts to justify their sins, by the sins of others, will not stand against the judgment of God. Will a person say to God, "I committed adultery, murder, theft, etc, but so did all of these ..."; for God's just justice will punish them all according to their deeds. Likewise, will a person say to God, "I committted adultery, murder theft, etc only the one time!, and look at all the persons I did not commit adultery with, or murder, or steal from ..."; for God just justice will punish for the single sin.
A person who is merely associated with a church, and in name only, has no more safety from the judgment of God than the non-professing sinner, and moreso, the false professing is in more danger, since they deceive themselves.
The attempt to change the focus of the OP, is also not an argument in favour of the position to transgress the 4th Commandment.
Beware your argument, lest it be taken that you accuse God.