This refers to a person who claims to know more about God and truth than everyone else. Alternate translation: "Whoever claims to know more about God."
## does not remain in the teaching of Christ ##
"does not continue to trust what Christ taught"
## does not have God ##
"does not belong to God"
## comes to you ##
The word "you" is plural.
## your house ##
The word "your" is plural.
## participates in his evil deeds ##
"shares with him in his evil deeds" or "helps him in his evil deeds"