As far as Six days.
“How does focusing on God’s ability to create the Earth in six days (vs some other amount of time) take the focus away from God?”
Exactly as manifested in your question above. It puts the focus on petty argument regarding side issues.
Judging an argument as petty doesn’t automatically equate it with idolatry. This is only your opinion.
Idolatry is worshiping something other than God. No one is worshipping something other than God here. Therefore, this is not idolatry.