I marvel that ye are so quickly removing from him that called you in the grace of Christ unto a different gospel;

I wonder that ye are so quickly removed from Him who did call you in the grace of Christ to another good news;

I am amazed how quickly you are deserting the One who called you by the grace of Christ and are turning to a different gospel—

I wonder that ye thus quickly change, from him that called you in Christ's grace, to a different gospel,