The Bible gospel promises a perfect new birth in Jesus Christ, with all things in life now being of God. Religions of man promise only a partial rebirth of a better life.
Therefore if any man be in Christ, he is a new creature: old things are passed away; behold, all things are become new. And all things are of God...
This is the Bible conversion of being born again by Jesus Christ. It is a perfect and complete new birth, that no more has anything to do with our past living. The new convert to Jesus becomes just as babes from the womb, that have no past living at all to condemn them.
All things are now at once made perfectly new and of God. There is nothing of the old life that remains of the devil. All things of the soul and life are now of God, and just as blameless as the man Jesus Himself.
Hereafter I will not talk much with you: for the prince of this world cometh, and hath nothing in me.
Any other kind of incomplete conversion in life is the religious conversion of man only.
All religions teach a form of godliness, that we should sin less, but never being purely newborn without sin and wholly blameless with God, even as Jesus was from the womb.
Having a form of godliness, but denying the power thereof: from such turn away.
This is common to Christian, Jewish, Muslim, Buddhist, etc... religions. They do not ever preach being holy in spirit and life with God in all things. They never preach being able to be holy in all our manner of conversation at any time, because they do not believe in ever being born again and made that way by God through Jesus Christ.
There is on simple question to ask any religious person on earth. Can man ever be perfectly holy, righteous, and blameless in life with God? If not, it's only because they don't believe the Bible's perfect conversion and reconciliation to God through Jesus Christ.
At best, some preach the Bible new birth and conversion as happening only after the grave. Until then, they are content with a religious conversion of their own, to sin less in a form of godliness, but never being perfectly conformed in this life to the image of God's dear Son.