We know that we have received the the Spirit of Christ is if there is a work of sanctification done by the Spirit in our lives. Speaking in tongues, performing miracles, doing many other good things is not the true indication of receiving the true Spirit of Christ. The main work of the Spirit is to conform us to the image of Christ. If there is no repentance, no change of heart, no fear of God, and no love for God and for one another, then no matter what we do we cannot say that we have received the Spirit of God.
Unless we know that we have received the Spirit of Christ, we deceive ourselves and others and the end will be more worse than the beginning. Just as Apostle Paul asked the Ephesians we need to ask the same question, “Have you received the Spirit [the Spirit of Christ] when you believed?” (Acts 19:2). The real question we have to ask ourselves nowadays is not have I believed? It’s did I receive the true Spirit of God when I believed?
“I hope you will put up with me in a little foolishness. Yes, please put up with me! I am jealous for you with a godly jealousy. I promised you to one husband, to Christ, so that I might present you as a pure virgin to him. But I am afraid that just as Eve was deceived by the serpent’s cunning, your minds may somehow be led astray from your sincere and pure devotion to Christ. For if someone comes to you and preaches a Jesus other than the Jesus we preached, or if you receive a different spirit from the Spirit you received, or a different gospel from the one you accepted, you put up with it easily enough”
2 Corinthians 11:1-4