Intentional Sin

Whoever abides in Him does not sin. 

Whoever sins has neither seen Him nor known Him.

1 John 3:6

The Bible makes two things clear about sin. First, living a lifestyle of sin indicates that you are not walking in the power of the Holy Spirit, regardless of what you say about your spiritual condition. You cannot regularly spend time studying and meditating on God's Word, praying and walking in fellowship with the Holy Spirit, and persist in sin.

Second, if you do not hate sin the way God does, then you do not truly know Him. There are those who continue in their sin yet insist that they love God and belong to Him. John makes it clear: If you have a lifestyle of sin, you have not seen Him and do not know Him. You may have prayed a “sinner's prayer,” or made a commitment in your church, or been baptized, but the evidence of the Holy Spirit's presence in your life is that you are defeating sin. This does not mean that you will never sin, but it does mean that you refuse to make sin a lifestyle and you immediately seek forgiveness when you sin (1 John 1:10). It means that you are opposed to sin, as God is, and you allow the Holy Spirit to eradicate every trace of sin in your life. It means that when you sin, you immediately confess it and repent of it and do whatever is necessary to avoid repeating your sin.

If you find yourself falling into sinful habits or not grieving over your sin as you once did, this indicates that you are not abiding in Christ. Return to Him in repentance; restore your fellowship with Him; and you will once again experience victory over your sin. - Blackaby Experiencing God Day by Day 

There is no room in the life of either a believer or an unbeliever for intentional sin.  In an unbeliever it's not even a second nature it's primarily what life is about.  In an believer it's the war within.  

Regardless of what you accept as reality, Spiritual Warfare is real. There's rules for physical combat and rules in physical war.  Essentially there are atrocities that most peoples or countries simply refuse to allow in times of war.  Not so in Spiritual Warfare.  It's anything goes.  Whatever Satan or his minions desire to use against believers to shut them down, albeit with permission from Jesus, goes.  There is evidence a plenty in the books of Job and Daniel of Spiritual Battles.  Those with Christ as their Savior indeed do have the indwelling Holy Spirit.  However until Christ calls them home, or the Rapture happens, they still wage war against their sin nature.  

People everywhere are at war and aren't seeing it.  Scripture says the god of this world has blinded the eyes of people.  Both believers and unbelievers are and have been manipulated by Satan since Adam and Eve.  The only defense is a life hidden in Christ Jesus. 

There's no tolerance to be given for sin.  We are inundated with temptations from the soft n gentle to the heavy and unmerciful.  People attribute other names to what God calls sin. They convince people that homosexuality is a lifestyle or life choice.  God calls it sin that shouldn't happen.  People don't see zealousness for sports as idolatry but God does.  Good example is this supposed pandemic. Great many people are fighting to get football reinstated yet those same are not heavily concerned at all of places were they cannot attend Church to worship God.  Likewise these supposed Church goers see no problem with integrating idol worship of sports with a worship service to God. 

No means no. Paul wrote heavily on the war within. He speaks candidly of not doing what he ought to and doing that which he knows he shouldn't.  

The fight is real.  The fight only ends at death.  Look at your choices today of what you are doing what you are thinking and what you are saying.  Do they reflect a life for Christ or do you only get excited about earthly things such as sports or politics?

What excites you says volumes of the condition of your heart.