This "literal" view is also not my private interpretation. You base your presupposition on outside information, "Evolution," and the idea of millions of years. The literal view is not an interpretation but it is simply the way the Bible states GENESIS, Literally. Because the rest of the Bible lines up with a "literal" view. Not the figurative view.
sin
1 
 /sɪn/
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Show IPA noun, verb, sinned, sin⋅ning.
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noun 1. transgression of divine law: the sin of Adam. 2. any act regarded as such a transgression, esp. a willful or deliberate violation of some religious or moral principle.
You see "sin" is not unfaith or disfellowship with God. That is a SIN yes, but what is the origins of sin? It did not enter through, "Mankind" or "Humans." Sin is a rebellion.
re⋅bel⋅lion
 
 /rɪˈbɛl
yən/
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n]
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noun 1. open, organized, and armed resistance to one's government or ruler. 2. resistance to or defiance of any authority, control, or tradition. 3. the act of rebelling.
You see here in #2 that this applies to what Adam did? So how have "Humans" plural rebelled against God? when did it start? Biblically you cannot prove this. but with the "literal" view we have justification for JESUS' Death on the Cross as for you is to preach the Gospel is to preach it without foundational knowledge.