GOD'S WORD® Translation
In addition, we are obviously witnesses who lied about God because we testified that he brought Christ back to life. But if it's true that the dead don't come back to life, then God didn't bring Christ back to life.

American Standard Version
Yea, we are found false witnesses of God; because we witnessed of God that he raised up Christ: whom he raised not up, if so be that the dead are not raised.

Berean Study Bible
In that case, we are also exposed as false witnesses about God. For we have testified about God that He raised Christ from the dead, but He did not raise Him if in fact the dead are not raised.

Douay-Rheims Bible
Yea, and we are found false witnesses of God: because we have given testimony against God, that he hath raised up Christ; whom he hath not raised up, if the dead rise not again.

English Revised Version
Yea, and we are found false witnesses of God; because we witnessed of God that he raised up Christ: whom he raised not up, if so be that the dead are not raised.

King James Bible
Yea, and we are found false witnesses of God; because we have testified of God that he raised up Christ: whom he raised not up, if so be that the dead rise not.

World English Bible
Yes, we are found false witnesses of God, because we testified about God that he raised up Christ, whom he didn't raise up, if it is so that the dead are not raised.

Young's Literal Translation
and we also are found false witnesses of God, because we did testify of God that He raised up the Christ, whom He did not raise if then dead persons do not rise;

1 Corinthians 15:15 Additional Translations ...