Part I
Not all brethren in Christ believe in the 'new earth creation' idea which is traditionally taught about Genesis 1, and this earth being only about 6,000 years old. Some of believers on Christ Jesus believe in an 'old earth creation', that God created this earth a long, long time ago, much longer ago than 6,000 years ago. Neither group believes in man's theory of evolution.
The actual origin of the 6,000 year old theory came from those like 17th century bishop Ussher's work with going from the time of Jesus' birth back in generations in the Old Testament to the time of the man Adam. Ussher set the time that God formed Adam in His Garden at 4004 B.C. (see Ussher's
Annals Of The World.) Other Bible scholars, like 19th century British Christian scholar E.W. Bullinger, did the same Bible chronology as Ussher did, and came up with the same 4004 B.C. date for Adam.
Then it was assumed... that since Adam was formed on God's 6th day, that's when the general time of His creation of the earth also was, being 4004 B.C. with adding our times of 2000+ years, to make the earth around 6,000 years old.
However, even Ussher would admit that 4004 B.C. is as far back as he could go with the Bible chronology of man, simply because there is no written record of a previous man prior to Adam in The Bible. So that's where the chronology for man... had to stop.
Yet that does not... have to mean that is where God's time of creation of the universe was also. That may sound confusing to some, yet it is nowhere written in God's Word that He created the earth at the time that He created the man Adam.
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The above is a fossilized set of footprints, I'm thinking from Dinosaur State Park in Texas (there are others around the world also). What is so unique about it is the large dinosaur footprint is laying on top... of a perfect human arch footprint, and both were dated to be at the same time. This set of footprints conflicts both with the 6,000 year old earth creation idea, and the atheistic field of scientific evolution. The reason why it conflicts with man's theory of evolution is because there's been no human fossil skeletal remains found back 65 million years ago when they say dinosaurs roamed this earth.
Because of fossil evidence like the above, and their not understanding it per God's Word, some brethren have gone to the extreme with claiming that dinosaurs are still walking around among us today. They call themselves 'New Earth Creationists', still applying the 6,000 year old earth tradition, but a bump to claiming dinosaurs are still alive on earth today in secluded sectors of the earth. Their extremist viewpoint thus denies that above footprint fossil as being any older than 6,000 years. The reality is that dinosaurs are definitely not... still walking around among us today. That is just a myth some brethren came up with in order to try and fight against man's theory of evolution, and preserve the 6,000 year old earth creation tradition.
The Gap idea does not agree with either the 6,000 year old earth tradition, nor... man's theory of evolution. Some Bible scholars that have been invited to debates between new earth creationists and scientists who believe evolution, have thrown monkey wrenches into their debate with both sides posing a huge question mark on their faces when they heard about the Gap idea from Bible Scripture.