So-called “Young Earth Creationism”, IE a belief that the Universe is less than 6000 years old, represents a simplistic interpretation of the Bible that can be exploited to promote atheistic beliefs.
“AND there was evening and there was morning, ONE day.” (Genesis 1:5)
“And…”, “one day” – The Bible is telling us that the “one day” was not the “first day”. There are ancient Jewish rabbinic sources (such as Breishees Rabbah) that indicate that long periods of time elapsed that are not detailed in the Bible because they are not pertinent to the message of the Bible.
“God separated the light from the darkness.” (Genesis 1:4)
“(prior to the fourth day) periods of light and darkness alternated due to causes other than the revolving of the planet around its own axis, due to the expression of God’s will.” (Commentary of Rabbi Ovadiah Sforno on Genesis 1:4, 16th Century C.E.)
Sforno is explaining that the “days” mentioned in Genesis are not necessarily the same length as our present days, they represent periods of time of unknown length. Thus we do not know how much time actually elapsed since the beginning of the Universe.
The Jewish Bible in the Book of Genesis is informing us that the Universe was created ex-nihilo in the finite past. However creation ex-nihilo is not a process that can be comprehended by Man nor can its details be described in the Bible.
The Bible was never intended as a science textbook for Man. The Bible is a book of ethics for Man that also contains some basic scientific information, but that information is incidental to the purpose of the Bible.
In contrast to erroneous ancient Greek science, modern science seems to agree with the Bible that the Universe had a beginning. Any finite age to the Universe claimed by the scientists may or may not be correct. Even if the scientists are claiming the Universe is billions of years old, as long as the scientists are claiming the Universe had a beginning in the finite past, they are not necessarily contradicting the Jewish Bible.
The actual age of the Universe is NOT important for understanding the Bible. What is important is that we believe that the Universe had a beginning in the finite past, such belief is not contradicting the Bible.
Religious people should not allow creation of a false contradiction between modern astronomical evidence and the Bible that enables any forms of atheism.