***Indeed. That doesn't say anything about the other six days***
It is safe to infer from the context of Genesis that if one day of the seven is literal then all seven are literal.
To do otherwise would indicate one is attempting to read one's agenda into the Scripture and not seeking to elucidate the meaning of the scripture.
***The first man? Yes, he did exist.****
Within the context of Gen 1, if the man is literal, the day is literal.
***I believe if I don't screw up, I get to purgatory and then heaven,***
I'd skip purgatory if I were you.
"And every priest stands daily at his service, offering repeatedly the same sacrifices, which can never take away sins. But when Christ had offered for all time a single sacrifice for sins, he sat down at the right hand of God,...
For by a single offering he has perfected for all time those who are being sanctified."
- Heb 10
The connections are incidental, and still don't prove anything.
I dont have anything else to add here.