You are all over the place. He doesn't choose to sin, he was born into sin and has a sinful nature. it is his nature to sin according to that work of fiction you swallow. You don't even know your own religion dude.
Yes, he chooses sin.
A sinful nature is a proclivity to sin not the active engagement in sin. When made righteous as a believer we still have a sinful nature, but we repent of our sin and are guided by the Holy Spirit that sanctifies us...we trust in the salvific work of God. If we choose to willfully engage in sin again we risk losing our advocate in Jesus Christ before the Father.
When I read about King David’s child with Bathsheba passing away and David suggesting that as a believer he would he see his child again in God’s kingdom it affirmed for me the innocence of children and others with disabilities that prevent them from making an honest choice about sin and Christ in their lives. They don’t need salvation because being saved by grace through faith in Christ means we are saved from the wrath/judgment of God. The innocents need not fear God’s wrath for they are without blame or need for judgment.
“Jesus called a little child to him and put the child among them. Then he said, ‘I tell you the truth, unless you turn from your sins and become like little children, you will never get into the Kingdom of Heaven. So anyone who becomes as humble as this little child is the greatest in the Kingdom of Heaven.’”
Christ also indicated how severely those that cause the children (the little ones) to fall into sin would be judged. The children are lead into sin and out of innocence.
As believers in Christ we are saved by grace through faith and thereby justified and deemed righteous….like the innocents who are inherently righteous we become like the them through Christ. Anyone who comes to God and desires forgivenessness and righteousness will be deemed as such.
No, I understand "my religion" just fine and I'm grounded right here and now.