I am a creationist. God created the heavens and the Earth. But I do not believe that it was only six thousand, or sixty thousand, or six hundred thousand years ago.
A day with God is as a thousand years, and a thousand years as a day (at the time that was written most folks had no concept of millions, let alone billions). What is a few billions of years to The Eternal?
When we finally meet Him, He'll clarify it all for us. What is important right now is that we accept the sacrifice of His only begotten Son as our salvation.
Yeah, but what if you're Jewish?
Amen to most of that, ESPECIALLY the last part.
The most important part is that one knows and accepts Christ. Beyond that, it can best be summed up that you need to “work out your salvation with fear and trembling.” I for one will stand before God and not have the embarrassment of having pointed at His Book and telling others “That Book lies!”
Having accepted Jesus, You are then also directed to spread His Gospel, His Word. In John 1:
In the beginning was the Word, and the Word was with God, and the Word was God.
2The same was in the beginning with God.
3All things were made by him; and without him was not any thing made that was made.
Jesus is the Word and the Gospel. It is hard to spread that Gospel while also declaring parts of it false.
Read Genesis again, it deliberately describes a day:
And God said, Let there be light: and there was light.
4And God saw the light, that it was good: and God divided the light from the darkness.
5And God called the light Day, and the darkness he called Night. And the evening and the morning were the first day.
Evening and morning. Not ‘some period of time’.
Having said all that, neither, directly, does the Bible say EXACTLY how long ago it was, though many have ‘worked out a date. 4000? 5000? 6000? Perhaps, Millions, not so much.
When we do finally meet Him, He may just ask many who did not believe what is written... “Couldn’t you read?”