How could one call Jesus Lord, but not a believer

How could one call Jesus Lord, but not a believer?
How could one can Prophesied, cast out demons and perform miracles and wonders in the Name of Jesus, but not a believer?

Matthew 7:21-23 (Jesus Said)
21. Not everyone who says to Me, "Lord, Lord," shall enter the kingdom of heaven, but he who does the will of My Father in heaven
22. Many will say to Me in that day, "Lord, Lord, have we not prophesied in Your name, cast out demons in Your name, and done many wonders in Your name?"
23. And then I will declare to them,"I never knew you; depart from Me, you who practice lawlessness."

Romans 10:9 NLT (Paul Said)
9. If you openly declare that Jesus is Lord and believe in your heart that God raised him from the dead, you will be saved

1 Corin 12:3 NIV
3. Therefore I want you to know that no one who is speaking by the Spirit of God says,"Jesus be cursed," and no one can say, "Jesus is Lord," except by the Holy Spirit

How could one call Jesus Lord, but not a believer?
How could one can Prophesied, cast out demons and perform miracles and wonders in the Name of Jesus, but not a believer?

Is this referring to Judas? Was Judas saved or not?
Jesus personally chosen Judas to be one of the 12 Apostles. Judas was sent out among the 12 Apostles to preach the gospel and cast out demons and perform many miracles in the Name of Jesus. Judas was baptized together with other Apostles (even it was not specifically mentioned in the bible, but it is a good assumption since Jesus were baptized by John and the Apostles were baptizing those who repent). Judas baptized those who repented. Jesus washed Judas feet. Judas was a partaker of the Lord's supper. Jesus said, if you eat my fresh and drink my blood, you are part of me.

Even though Judas betrayed Jesus, but it was a prophesy that one will have to betray Jesus, Judas was the one. But Judas repented. He said,"I have sinned, I have betrayed innocent blood". He returned the money to the pharisees. Satan enter Judas at the point when it is time for the prophesy to come to pass, at the point where he took the bread from Jesus. But when satan left him, he came back to his senses, he confessed his sin and repented and do restitution by returning the money.

Could an Apostle not saved yet? Or when a person was saved, he could loose his salvation? If one can do so much for God and finally loose his salvation, it would be saver to be like the thief on the cross, to time it at the end of his life then say the sinner's prayer to receive Jesus.

Jesus interceded for those who killed Him, "Father, forgive them for they know not what they are doing"

Is there any difference between betraying Jesus and killing Jesus?

But Jesus condemn him, "it would be better for him not to be born". It was not Jesus ministry to condemn anyone.
John 3:17 "For God did not send His Son into the world to condemn the world"
Judas committed suicide, an act of self-righteousness and died before Jesus can die for him
He didn't call Jesus "Lord", he called Jesus "Rabbi and Teacher"
He continue to steal as a treasurer even during his time with Jesus and his ministry with Jesus
Matt 7:21-23, even not all who called Jesus "Lord" will not be saved anyway

Matthew 7:21-23 (Jesus Said)
21. Not everyone who calls out to Me, "Lord, Lord," will enter the Kingdom of Heaven. Only those who who actually do the will of My Father in heaven will enter.
22. On judgement day, many will say to Me (in that day), "Lord, Lord, we prophesied in Your name, and cast out demons in Your name, and perform many miracles in Your name?"
23. And then I will declare to them,"I never knew you; depart from Me, you who practice lawlessness (break God's law)."

Maybe the key word in these verse is Practice Lawlessness (breaking God's law)

What is Jesus' definition of Lawlessness?
Jesus' definition of Lawlessness is sin

What is the bible definition of sin?
The bible definition of sin is anti-Christ. Not believing in Jesus Christ as God

What is the Will of My Father?
The Will of My Father is believe Jesus is God

The key word is "On judgement day" (NLT), other version (in that day)

Was Jesus referring to the Pharisees, Sadducees and Teachers of the Law,?
- who are self-righteous
- who believe in God (the God of Moses), but Anti-Christ (never believe Christ is also God). They might have called God Almighty as "Lord", but never believe that Jesus is also God Almighty. Jesus was warning them that they called God Almighty "Lord", but Jesus as God, never knew them. They called God Almighty as "Master or Lord"

Was Jesus referring to generally the Jews?
- who believe in the Almighty God, but not believe the Jesus is also God. They are not anti-God, but they are anti-Christ.
- who called God Almighty as "Lord" (Who is Jesus), but failed to recognize that Jesus is also God Almighty. So, to this group of people, Jesus said I never knew you, depart from me. The Jews called God Almighty as "Master or Lord"

Was Jesus referring to Judas?
- who cast out demons and performed many miracles in Jesus Name, but never called Jesus as Lord. Judas was also a Jew. He also called God Almighty as "Master or Lord" even though he never recognized the Lordship of Jesus Christ.

So, on Judgement day, when this group of people finally realized that Jesus = Almighty God, then they will starts to be religious about themselves in order to gain salvation. "Didn't I called You Lord? Didn't I cast out demons and performed many miracles in Your Name" even though they did not.

Only Jesus fulfilled all of God's law. So those who believe in Jesus, they ledge on to the righteousness of Jesus, not their own righteousness. But to the unbelieving Jews, the Pharisees, Sadducees and Teachers of the Law, they are self-righteous, they don't have the righteousness of Jesus which had fulfilled all the requirement of the Law, hence, they broken God's law or practice lawlessness.

Matt 7:21-23 is definitely not referring to believe Christians.