God does not save the unlucky person, even by His marvelous grace, who does not follow Him in obedience. You don’t just waltz in, say “Okay God. Looks good”, then walk out and do your own thing. The Godman Jesus said “Follow Me”. The concept of getting saved without then obeying and following Jesus is not in the Bible.
The Holy Spirit only resides in true believers
There is a rather chilling phenomena happening right now, these days of what Jesus called “the end of this age” in which we are lucky to be living now. This phenom is: so-called Christians are not actually real, true Christians.