Those people are zealous to win you over, but for no good. What they want is to alienate you from us, so that you may have zeal for them. (NIV)
These men [the Judaizing teachers] are zealously trying to dazzle you [paying court to you, making much of you], but their purpose is not honorable or worthy or for any good. What they want to do is to isolate you [from us who oppose them], so that they may win you over to their side and get you to court their favor. (AMP)
They zealously affect you, but not well; yea, they would exclude you, that ye might affect them. (KJV)