Rev, how do you propose to train your deacons and elders to know 1500 people in 6 or more services over the weekend to determine who is ok to take communion??? Maybe a few could recognize all the members although I doubt it, but even then how would one know about the sin of anothers heart?
The key word (and I probably forgot to mention it earlier) is "knowingly". You are right that I cannot know what is in the hearts of my members. Even those who I have instructed and taught the Scriptural truths may not believe it but tell me they do anyway. In those cases, it is between the individual and God. God will judge as He wills.
But the things that I DO know about, such as their public confession, I must go by. If someone is not Baptized, I need to know why. And if they are not Baptized, they certainly should not receive communion. If someone is a member of a church that denies the Real Presence in the Sacrament, I must also deny them the Sacrament because discernment of the Lord's body in the Sacrament is necessary for worthy reception according to 1 Corinthians 11.
To have an announcement in a church bulletin or whatever that simply states that anyone can come to the table, even if they are not baptized, with no statement of the confession of faith, is purely irresponsible on the part of the pastor. No, he cannot know what is in a person's heart. But he can, indeed he must, make known the teaching concerning the Sacrament so that those who are not members will know what is at stake.
My pastor has stated that he has refused communion and church membership to a some people but those were ones whose circumstances he knew firsthand.
Very good.
My point again is that when we rely on the Holy Spirit he does convict and lead us to truth, so that we are able to examine ourselves. I know that I have certainly been made more aware of my sins the longer I walk with Him. Things I would not have thought sinfull before now I see and repent from. But that comes from God not from some preacher or elder whose heart may or may not be in a position to judge another.
But, again, the pastor is the one who is called by God to make sure you know what sin is, that you know what truth is, because as sinful human beings we need to be told that continually. The Holy Spirit calls the pastors and, through them, leads us in His way. Unless the shepherd constantly watches and guides the sheep, they will stray and walk off of a cliff. That's why God calls and ordains pastors. I think God knows what He's doing in that regard.