How old do you think Earth is? Why?
I think the earth is really very very old. It's not even possible to adequately express it in human related terms. In terms of why I think it's that old I can say it's just a feeling I have - I sense the ancientness of earth you could say.
2 Corinthians 4:4
The god of this age has blinded the minds of unbelievers, so that they cannot see the light of the gospel of the glory of Christ, who is the image of God.
But even the believers are blinded about things that they don't trust and believe God for -
http://www.albatrus.org/english/theology/creation/biblical_age_earth.htm.
Genesis 1:27 Young's Literal Translation:
And God prepareth the man in His image; in the image of God He prepared him, a male and a female He prepared themTherefore I am in the image spoken of. I do see the glory of man. It's great, it's wonderful. It has opened my eyes and now I see. I see the earth is really really old.
Is that where you stopped reading? Right after the image of God part? Don't you remember that mankind lost the perfect image of God when sin came into the world? Only through belief in the death of Jesus, and His resurrection, is that image restored.
But we don't see that image restored right now. Why not? Because the restoration is by faith in God, for a time when God will destroy this universe and take His faithful ones to the New Universe He is preparing for us.
How do we know that the restored image is not for this life? We know it because we daily make mistakes. And nobody can keep himself/herself from death when his/her time is up.
The mistaken idea that the earth is really old, beyond the 6,200 years or so, is something that can be forgiven by God, if the ignorance of the age-of-the-earth fact is held a certain way. But it is dangerous to hold the wrong age in mind. Here is why.
You didn't actually watch the life, death and resurrection of Jesus while it was happening. You understand it by faith in God, that the words God directed His apostles and prophets to write is correct. Yet, it is only by this faith that you will be saved, because you didn't actually witness the things of the past. If you reject the words that God wrote about Jesus-salvation, you will lose your salvation. So, how is it that you can pick and choose which words of God to believe? Either you believe what God says or you don't. And if you don't believe Him about the age of the earth being about 6,200 years, why would you believe Him about Jesus-salvation? And if you don't believe Him about Jesus-salvation, you don't have salvation.
The Bible is a complex thing. Anybody can hold a mistaken understanding of some of it and be forgiven. If you mistakenly think that
this explanation is not the thing that God was expressing -
http://www.albatrus.org/english/theology/creation/biblical_age_earth.htm - but that God was expressing something else by those words, then you could still be believing God, and that is what is important for you salvation.
But the words at
http://www.albatrus.org/english/theology/creation/biblical_age_earth.htm are quite clear. So don't reject them if you want to believe what God says. Otherwise you just might not believe Him for salvation, either.