So just believe and you can do whatever you want. That's essentially what you're saying.
No, please pay attention. Jesus SAID that those He gives eternal life shall NEVER PERISH. John 10:28
So, the only question that remains is: to WHOM does He give the gift of eternal life?
That is answered in John 5:24 - “Very truly I tell you,
whoever hears my word and believes him who sent me
has eternal life and will not be judged but has crossed over from death to life.
He SAID: "whoever hears and believes...HAS eternal life".
When does a person have eternal life. When they become a believer.
These dots are so close you just can't help but connect them.
Those who believe have/possess eternal life. John 5:24
Those given eternal life shall never perish. John 10:28
If you don't believe these clear words, you don't believe Jesus, because He said them.
However, to put your feverish mind to rest about those who believe and then "do whatever they want", know this: God's hand of discipline is PAINFUL, per Heb 12:11.
What did Paul teach about the incestuous believer in 1 Cor 5?
v.5 - hand this man over to Satan for the destruction of the flesh, so that his spirit may be saved on the day of the Lord.
Do you have any idea what might be involved when sinful believers are turned over to Satan "for the destruction of the flesh"?
This isn't about some simple "slap on the wrist" kind of thing. Oh no. When Satan is allowed to kill (destruction of the flesh) a believer, you can bet it won't be pretty.
1 Pter 5:8 - Be alert and of sober mind. Your enemy the devil prowls around like a roaring lion
looking for someone to devour.
So, put that busybody mind of yours to rest.
No one "gets away" with anything. God is just. He WILL take care of His children who stray. And it's none of your business.