I can't immediately think of any scriptures about this, but I will have a think about it!
The whole relationship thing - um, hard to describe really - I'm conscious that there is something within me which isn't actually me. So, not my own awareness or a consience or anything, but something separate which is always there. I don't necessarily think about it very often, but when I do I'm always conscious that it is there. And when I pray, I'm aware that I'm talking (silently!) to it or through it or maybe both.
That's what comes from my own experience and understanding - at the same time the Bible tells me that it is the Holy Spirit dwelling in me, and through its presence I can communicate with God.
I can talk to/through it in words, but what comes back isn't exactly verbal - usually more a sense of rightness or wrongness about things, sometimes disappointment or a bit of annoyance! Occasionally it's a lot more clear than that, with a strong awareness of something I ought to be doing, but not so often.
I always have the choice of whether to be guided by it or not, and it was my choice to give it "house-room" back when I was a teenager. I would be able to send it away if I chose to, but I can't see that happening.
I do believe what the Bible says about the Incarnation and Christ's death and resurrection making a different relationship with God possible, and I do believe that what I experience is the Holy Spirit as described in the NT.
So, for me, having faith in Christ is about believing that what God (father, son & Holy Spirit) wants for the world is right, and that I am able to be part of that in some very small way, by the choices that I am led to make.
Does that seem to make sense?