As you read or listen to these biblical passages, what is the real objective of evil angels? How do they harm us?

1. What do Satan and his demons do to non-Believers? How do they work on non-Believers? What clues do you observe with the apostle Paul's confrontation of Elymas?

But Elymas the sorcerer (that is the meaning of his name) opposed them and tried to turn the proconsul away from the faith.
But Saul — also called Paul—filled with the Holy Spirit, stared straight at Elymas and said, “You are full of all kinds of deceit and trickery, you son of the devil and enemy of all that is right. Won't you ever stop perverting the straight paths of the Lord? (Acts 13:8-10, CSB)

2. Observe what the apostle Paul is warning the Believers of the church of Corinth. What disguises does Satan and his demons put on? What are they trying to do?

But I will continue to do what I am doing, in order to deny an opportunity to those who want to be regarded as our equals in what they boast about. For such people are false apostles, deceitful workers, disguising themselves as apostles of Christ. And no wonder! For Satan disguises himself as an angel of light. So it is no great surprise if his servants also disguise themselves as servants of righteousness. Their end will be according to their works. (2 Cor 11:12-15, CSB)

3. Moses foretells what happens when Believers have a weak faith in God. What can Satan and his demons do?

They provoked His jealousy with different gods;
they enraged him with detestable practices.
They sacrificed to demons, not God,
to gods they had not known,
new gods that had just arrived,
which your ancestors did not fear. (Deut 32:16-17, CSB)

4. The apostle Paul warns Believers what happens when Believers have a weak faith in God. What can Satan and his demons do?

But sexual immorality and any impurity or greed should not even be heard of among you, as is proper for saints. Obscene and foolish talking or crude joking are not suitable, but rather giving thanks. For know and recognize this: Every sexually immoral or impure or greedy person, who is an idolater, does not have an inheritance in the kingdom of Christ and of God.
Let no one deceive you with empty arguments, for God's wrath is coming on the disobedient because of these things. (Eph 5:3-6, CSB)

5. What can you do to protect yourself?