Some Christians have expressed doubt about a literal 24 hour day, before the sun and moon were created in:
Genesis 1:16 KJV And God made two great lights; the greater light to rule the day, and the lesser light to rule the night: he made the stars also.
Advocates of the gap theory have based much of their argument on verses 1 and 2 of Genesis, because there was no light.
Gen 1:1 and 2
In the beginning God created the heaven and the earth. And the earth was without form, and void; and darkness was upon the face of the deep. And the Spirit of God moved upon the face of the waters.
In Genesis 1:3 God created light:
Genesis 1:3 And God said, Let there be light: and there was light.
However: the light was not separated from the darkness (and even I have a hard time imagining that even though I do not question it). Then in verse 4 Go does separate the light from the darkness.
Genesis 1:4 And God saw the light, that it was good: and God divided the light from the darkness.
In verse 5 God designates day and night, and calls the combination of the two the first day.
Genesis 1:5 And God called the light Day, and the darkness he called Night. And the evening and the morning were the first day.
Do any Denominations believe that up until verses 4 and 5 there was an indefinite period which had no specific number of hours, or days, or years by our concept of time?