“Which Bible would that be? “
Every translation contains the Gospel of Christ. I have 20 some on my computer. The all include the Gospel.
“If it’s so black and white why are there so many denominations or religions that dispute it’s meaning? “
There is controversy because the is nothing people can’t use for evil. It remains there for every seeker to see. Whether the accept it is another issue.
“If it’s always been, why has the Bible been changed so much? “
It has not. Refer to the Dead Sea Scrolls as evidence.
“What role does Solomon’s Song play in my salvation?”
None. Did you think the Gospel is all that the Bible contains???
“Why is everything in the Bible not taught and practiced?”
You are asking questions that indicate you are unfamiliar with the Bible. Nothing wrong with starting there. We all do.
Some portions of the Bible were for Israel, when under a Theocracy. Christians do not practice the portions not given to the nation of Israel. We do teach them. In short, it isn’t all about us, but we benefit from it all.