Do you mean you once believed this...
1 Corinthians 15:1 Moreover, brethren, I declare unto you the gospel which I preached unto you, which also ye have received, and wherein ye stand; 15:2 By which also ye are saved, if ye keep in memory what I preached unto you, unless ye have believed in vain. 15:3 For I delivered unto you first of all that which I also received, how that Christ died for our sins according to the scriptures; 15:4 And that he was buried, and that he rose again the third day according to the scriptures:
2 Corinthians 5:19 To wit, that God was in Christ, reconciling the world unto himself, not imputing their trespasses unto them; and hath committed unto us the word of reconciliation.
5:21 For he hath made him to be sin for us, who knew no sin; that we might be made the righteousness of God in him.