Salvation is of God is and guaranteed on Gods part, I think we all know that.
He is faithful.
We can not be forced out of his hand but we can let go of it.
Our faith in him and continued faith in him is required from the beginning to the end.
But being born again includes conception, formation and birth into the light.
That is a process that we know by experience in the context of Gods creation is not instantaneous.
A child must abide in the vine
until Christ is fully formed in them
Then they are born into the dawning of the light
The good seed is eternal in its nature, that being Gods seed.
Like any pregnancy the seed or sperm needs to be good (Check)
But the child must continue connected to the vine of the umbilical i order to receive life and be fully form and be able to be born.
That attachment to God through Christ is pictured in that vine or umbilical and our faith is the equivalent of abiding in the vine.
If we abide and since the seed is good the life that would result is guaranteed.
But the word is clear
If we abandon faith we will be cut off
If we endure to the end we will be saved.
If we abide in the vine we have life.
If we deny Him before men He will deny us before God.
If we continue in sin, its deceitfulness is likely to harden our hearts and cause us to fall away from faith
It is a good thing to be able to distinction where you really stand
Anyone who does not practice righteousness is not of God
Because if you find yourself on the outside while thinking you where in faith just because you know about God at least you can do something about it before it is too late.
For eternal life is not in knowing about God and saying you believe it.
Now this is eternal life, that they may know You, the only TRUE God, and Jesus Christ, whom You have sent. - John 17:3
But you know that Christ appeared to take away sins, and in Him there is no sin. No one who abides in Him keeps on sinning. No one who continues to sin has seen Him or knows Him. Little children, let no one deceive you: The one who practices righteousness is righteous, just as Christ is righteous - 1 John 3:5-7
So i would say sin is hazardous to our faith, which is precious in that by our faith we lay hold of Christ and through abiding in Christ the life of God flows to us and that seed grows in us until Christ is fully formed in us and born again.