If it was proven, beyond doubt, that it was 4 billion years old, whould it change yours?
If it where also proven that evolution actually happened.
It would mean that objective morality did not exist.
It would mean that neither you nor I have free will.
It would, and has devalued human life.
And just so you understand, objective morality is that sense of right and wrong that everybody has, regardless of what they have been told.
Now, as a practical matter we have been living in your world for the past 150 years.
A proven, less than 10,000 year old earth would have no impact on how you viewed things ?
You are only left with two options.
Creation or Aliens.