Personally, I believe that if one truly believes, he or she isn't going to be like "I'm saved now...awesome..." and act as if nothing even happened. As the Holy Spirit inhabits you, you aren't going to be compelled to live the life prior to being saved. Of course, there is a natural progression, not a corny ass "Oh, I see the light" night and day change.
the Holy Spirit does inhabit us, but He does not force us to do the Father's will, nor does He take control over us. In all essence, He still can be quenched, and resisted...
1 Thessalonians 5:19
Do not quench the Spirit.
Acts 7:51
Ye stiffnecked and uncircumcised in heart and ears, ye do always resist the Holy Ghost: as your fathers did, so do ye.
in Matthew 3:11, John the Baptist tells us Jesus will come and baptize us with the Holy Spirit and fire, yet from Paul in 1 Thjessalonians, we also see that through disobedience and sin, the Holy Spirit is taken away. the Spirit of the Lord was removed from King Saul because of his disobedience...
and many people do experience that, Warhammer... it's called "easy believism"... it's a false gospel that teaches all you gotta do is answer to an alter call, say the sinners prayer, and from then on, no matter what you do, no matter what sin you commit, you are saved.
that's the danger of teaching such things... you take away the responsibility and free will of the Christian, and allow for a very antinomian lifestyle.
and concerning the light and day approach, yes, that
does happen. in Acts 8, Philip preaches to an Ethiopian, baptizes him, and from then on, he was changed instantly. In today's society, i have talked with street preachers who have witnessed to the lost, and have seen that exact turnaround... i even witnessed the gospel to a homeless man, and literally watched him change from night to day... it took Saul only three days to make a complete 180, and become Paul. Acts 9:18 says "And immediately there fell from his eyes as it had been scales: and he received sight forthwith, and arose, and was baptized"... the immediate turnaround
is possible and does happen
the utter truth in all of this, Warhammer, is that without repentance, there is no forgiveness:
Acts 2:38
Then Peter said unto them, Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost.