Please find below the study.

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1 John 2:22-23, “Who is the liar? It is the man that denies that Jesus is the Christ. Such a man is the antichrist – he denies the Father and the Son. No one who denies the Son has the Father; whoever acknowledges the Son has the Father also.”

Interesting points:
1. In these verses, John builds on the previous verses to better define the liars mentioned in Verse 18 as those who deny that Jesus is the Christ (Messiah) and to reaffirm that Jesus and our Heavenly Father are one. When a liar denies Jesus is the Savior, he denies the Father.

2. Such a liar may acknowledge some aspects of who Jesus is, but will not accept the true message of Jesus as both fully human and fully divine. Just as those who reject Jesus are rejecting God as well, a true believer accepts both God the Father and Jesus the Son. John specifically notes this by confirming that those who accept Christ accept God the Father. The person who confesses or believes in Jesus as Lord (Romans 10:9) has the Father. This is because Jesus is the only way to the Father (John 14:6) and is the only name under heaven by which we must be saved (Acts 4:12). This is the message they had heard from the beginning (1 John 2:24). Any different message is to be rejected.

Application:
Brothers, some religious groups accept God the Father or Jesus or even the Holy Spirit, but not all three persons as the one triune God. Any religion that accepts Jesus as something less than eternal God, fully human and divine, is a false religion and those that proclaim such religions fit the description of false teachers / antichrists.

As such, since most unbelievers are blinded to the truth by our enemy, the best thing we can do is pray that the Lord will open their eyes to the Truth that we proclaim (with our actions, lips or in writing) so that their stubborn stance will fall apart and that they will choose to enter a relationship with the one true and almighty God!