as it happens, my ex was a sociopath and he was a christian proper. yy that messes up everybody's ideas about christianity - it did mine, I can assure you. afaic he's in heaven (because he's dead you see).
I'm not bristling with theology, me, but imo God's spirit is 'knowable', if you like. We can all access God's spirit and know it for what it is, though we may not be able to name it. eg a song or a painting will have a particular flavour and we know without being told it's by so-and-so. imo it's the same with God's spirit.
Getting to know about God, listening to what he has to say (eg the bible) is definitely one way of getting to know him, as you would get to know anyone by what they say. imo many have submitted to God's spirit without necessarily knowing in their minds what they are doing (the first shall be last etc). They may not know that God paid an exceptionally high price to have a relationship with them and it would probably be a delight, as well as awesome and humbling, to know. They can still have a relationship with God though, even if they don't know. I mean a proper relationship not a pseudo relationship in the mind, say.
The theology goes that it's in the submitting, fully, that the spiritual transaction takes place ie God's spirit joins with ours, literally inhabits our spirit/being. It may be dramatic or it may be, initially, imperceptible, but before long it becomes apparent. YOu have the choice, at any stage, to ignore it or go with it. Again, the bible is handy on this as it shows what he's like and the type of thing he is likely to do. You'd get to know anybody if they'd written a tome of letters to you.
re my ex: he did, as far as he was able (I assume), submit to God's spirit and made the decision to hand his life over to God. It had nothing at all to do with right or wrong, good or bad, but an invitation to relationship that he took up. imo the spiritual transaction took place, regardless of ex's subsequent behaviour, because that is what God has promised he would do and does make a big deal out of not practising favouritism. Ex graphically illustrates that it's not what you do ('good works') or who you are that repairs the breach between you and God, but who God is and what he does. I don't like religion that promotes 'doing things' to 'pay' the way to God. That seems ridiculous to me - how can you possibly pay for something that is absurdly out of your remit?
Sin means, literally, separated from God, not in relationship with God. People do a lot of things with that, some very bad and some not so bad at all, but it's all the same stuff. incidentally, when God's spirit takes up residence it soon becomes apparent that our motives are not as great, or innocuous, as we thought they were. God loves, entirely, and anything he does will have love as the aim - we can't say the same, hand on heart. It's serious stuff here, really serious, even if we in the west don't necessarily bear the brunt of how serious life can be. God loves the world and it is his aim to get his love to the world not just the individual. That too, mind, (lavishly) but he gets it to the individual to get it to the next individual etc, not to sit in a pool in the first individual and go putrid.
Gone on a bit there as per usual