"Who are you to Judge someone else's servant? To his own master he stands or falls. And he will stand, for the Lord is able to make him stand." -- Romans 14:4.

"Therefore let us stop passing judgment on one another. Instead, make up your mind not to put any stumbling block or obstacle in your brother's way." -- Romans 14:13

 It's pretty simple: if you are a Christ follower, you must disqualify yourself from Judging other Christ followers. Feel free to give advice (if advice is requested). 

If you feel a fellow believer has "missed God", pray for their restoration.

That's where your authority ends.

Because you cannot guarantee another person's salvation, you cannot judge them or where they are on their path. Because you cannot cancel another person's salvation, you are not qualified to judge their salvation.

 Relax.

 As the Apostle Paul writes: "Let us therefore make every effort to do what leads to peace and mutual edification."

Just relax.