Jeff, I like your honesty, openness and sincerity. Definitely nothing you said angered me as a believer in Christ.
I believe you are sincerely looking for truth come what may, as we all should be. Fact is, I really like talking to people who are open to possibilities, but skeptical and questioning.
Just a thought but , is it possible you don't have spiritist type experiences because you are being protected from them?

As far as sin goes, I think the spiritual link between mankind and God was severed at almost the very beginning of our(mankind's) existence. God immediately promised to provided a bridge to bring us all back. Anyone before the cross just had to accept his offer and believe he would do what he promised. Anyone after the cross just needs to accept his offer and believe that he accomplished it. This world truly isn't what it seems, each of us has a very important part in all of it.
Keep talking any subjects that inspire you, always well done.