The earth is indeed billions of years old. In Genesis, it says that the earth was void and without form. In the original Hebrew, that phrase is "Tohu vah bohu", which means "became that way", not created that way. That was the end of the first world age as Peter mentions. The three world ages.........we are in the second. The world that then was, belongs to the dinosaurs and all living creatures of that fossil age. The world being created in six "days" is an invention of the translators. In the greek, it is six eons or periods or ages, not 24hr days. God created the heavens and the earth, but it does not say when the beginning was.
The word of God is true, and every word that proceeds from the mouth of God is true, but not every word in the bible came from the mouth of God, it came from many translators, based upon misconceptions they may have had at the time. Christians need to stop being so lazy as to accept "traditions" and "doctrine" based upon the minds of men and get into the original languages by using a concordance or lexicon, and , if I dare say....common sense.
In the original Hebrew, God, created "bara" the heavens and the earth. This is a unique word in Hebrew, used only when referring to the creative energy manifested by God.
Each of the 6 days were "Yom" which means a 24 hour day, esp, when morning, night, day or a number is used with them. That is just what "Yom" means.
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God called the light Day, and the darkness he called Night. And there was evening and there was morning, the first day." Gen. 1:5
"And God called the expanse Heaven.And there was evening and there was morning, the second day." Gen. 1:8
"And there was evening and there was morning, the third day." Gen. 1:13
And so on through the other three days of creation. No millions of years, just God creating in a 24 hour period.
I have been a short day creationist since before I was saved. In fact, it was in a secular college, taking biology and geography I realized that evolution and "millions of years" was a faith based religion, which put man's false ideas before a Creator, and I went looking for the Creator and found him in Jesus Christ.
Theologicially speaking, you cannot be a theistic evolutionist, because if there was no literal first Adam, then Jesus could not be the Second Adam.
"Thus it is written, “The first man Adam became a living being”; the last Adam became a life-giving spirit." 1 Cor. 15:45
"For if, because of one man's trespass, death reigned through that one man, much more will those who receive the abundance of grace and the free gift of righteousness reign in life through the one man Jesus Christ." Romans 5:17
So many of you have been brainwashed to think that evolution is science, when it is neither repeatable nor observable. Evolutionists have played fast and easy with ancient evidence, which shows micro evolution, NOT macro evolution, or variation within kinds.
Any exposure to geology shows a world in which the present does not reflect the past. Small scale catastrophes like Mt. St. Helens, and the rapid formation of layers of ash, and mud, the creation of canyons through not just the mud, but also through solid rock, to say nothing if the rapid formation of badlands, and other geological features, indicates that a short earth is the best observable confirmation of the age of the earth.
I saw Ken Ham last weekend at a conference with the AiG people, and it was an amazing treat to hear the scripturally correct interpretation of the age of the earth.
Without a 6 day creation, the Fall, and the consequences if sin, you have no theological basis for sin and death entering the world. A short earth best answers the question of the age of the earth using the original Hebrew, a model of catastrophic events like a Genesis flood fits the data on the creation of landforms, and theologically maintains the integrity of the whole
Bible.
Without Adam and Eve, sin and death, Jesus Christ was not needed to correct the wrong which started in the Garden of Eden when Jesus providing redemption for our sin by dying on the cross.
You can believe what you want about the age of the earth, but only a literal 6 day creation and a short earth satisfies the Bible and geology, in one easy step of faith.