New Living Translation
But if you don’t believe me when I tell you about earthly things, how can you possibly believe if I tell you about heavenly things?

American Standard Version
If I told you earthly things and ye believe not, how shall ye believe if I tell you heavenly things?

Berean Study Bible
If I have told you about earthly things and you do not believe, how will you believe if I tell you about heavenly things?

Douay-Rheims Bible
If I have spoken to you earthly things, and you believe not; how will you believe, if I shall speak to you heavenly things?

English Revised Version
If I told you earthly things, and ye believe not, how shall ye believe, if I tell you heavenly things?

King James Bible
If I have told you earthly things, and ye believe not, how shall ye believe, if I tell you of heavenly things?

World English Bible
If I told you earthly things and you don't believe, how will you believe if I tell you heavenly things?

Young's Literal Translation
if the earthly things I said to you, and ye do not believe, how, if I shall say to you the heavenly things, will ye believe?

John 3:12 Additional Translations ...