The fellowship is about relationship. It means to be close to God, and not to be close to the world. It is to distance yourself from the world and be close to God.
Those who belong to God and those who are close to God listen to God's words. God's word is truth. If you accept the Word, you will receive the Spirit of truth, that is, the Holy Spirit. So, you can distinguish a person from the reaction to the Word. Those who accept the Word are people of truth, and those who do not accept it are people of delusion.
Just because you go to church, it does not make you a man of God, and just because you confess your faith, it does not mean you are not a man of God. Only with the Word, the true nature of that person is revealed.
Excerpt from Pastor Lee’s sermon on Dec 1, 2022.
1 John 4:4-6