"For if while we were enemies we were reconciled to God by the death of His Son, much more, having been reconciled, shall we be saved by his life." (Romans 5:10).
The meaning of this text is simple and clear. We (meaning Christians born again by the work of the Holy Spirit) were reconciled (brought into a peaceful relationship with) God, even while we were His very enemies.
What a statement!
We (Christians) were enemies of God; and while we were His enemies, we were brought back to God in a right relationship and belief in Him.
How did this happen?
By the death of His very own Son, God made us to be reconciled. And not only that, but by the life of Christ (resurrection) we will be saved forever from the ultimate wrath of God (Romans 5:9-10).
This means that our reconciliation was made effective by one act in history -- the death of the Son of God. That is how and when we were reconciled to God.
To the non-believer, or anyone living in unrepentance, there is no peace with God, no friendship with God, no escape from the wrath of God, whether one believes in His existence or not.
The only reason why Christians can claim a right knowledge of God, a right relationship to God and a right hope with God, is because Jesus Christ died and rose again for us.
That is our only boast.
We are nothing but recipients of undeserved mercy, and so we have become Christians because Christ died to bring us into peace with Him. The unreconciled are left fighting against God and ultimately defeated by Him without reconciliation.
So in order to explain ourselves, the reason why Christians are the way we are and have the hope we have is one reason -- Jesus died for us.
You cannot ask us to change our minds, we cannot change our minds, because God has reconciled us to Himself by the death of His Son. This is our solid defense and unfailing hope.
He has done it, we can't deny it.
"While we were enemies we were reconciled to God by the death of His Son."