I was just looking that up again. Days of the week are talked about -- Wedn, Thurs, Friday, and 1st day of the week -- being Sunday is the Only mention of a specified # of a day. So you're dwelling / fixated on a 6th day of the week. So - what Day of the week are you advocating for.
To be pursuing this discussion Could be casting doubt on other events in the New Testament. Jesus feeding the 5,000 people with Only two fishes and 5 loaves of bread. How could That be possible?! Or turning the water into wine. How was That possible?! These questions are retorical in nature. We are told in God's Word that they Did take place. I certainly would Not want to be responsible for turning anyone Away from trusting in the authority of God's Word.
God's Word gives mankind salvation -- it's because Of the bodily resurrection of Jesus that we Do have salvation. It proves that He was , indeed, the Son of God.
And 1 Corinthians 15:1-4 are 'to be saved' a person will believe these things. That He , Jesus Christ Did die on the cross, that He was buried and that He Did rise again on that 3rd day, according to Scripture. So -- do You believe that Jesus is the Son of God? and , yes, I've asked you that previously.
And, yes, This is an important doctrine -- as is the fact that Mary, a young lady, was a virgin, and the Holy Spirit came upon her and she became pregnant. Because That enabled Jesus to be 100 % human as well as 100% deity. And That enabled Him to be the only person/ entity capable of taking our sins upon Himself, dying with them -- in our place-- and rising from the dead bodily -- on that 3rd day after His burial.
And , in Romans 10 -- a person believes in the Heart and confesses with their mouth, the Lord Jesus. And Then the Holy Spirit comes to indwell the person and doesn't leave until they are safe with Jesus Christ in person.