Can Christians be cursed? As a believer, can I come under the curse?

The day you accepted Christ as your Lord and Savior, you became a new creation (2 Corinthians 5:17). As a Christian, a believer in Christ, curses no longer have the right to operate in your life. This is because Jesus took all your sins—past, present and future—on the cross, became a curse for you (Galatians 3:13) and bore the full wrath of God for them.

So today, you are totally forgiven (Colossians 2:13) and fully righteous before God.
Regardless of your circumstances, always hold firm to the truth that you have been redeemed from every curse of the law, and that your heavenly Father loves you very much (John 3:16). He cares for you affectionately and watchfully (1 Peter 5:7, AMP), so come boldly to His throne of grace (Hebrews 4:16), and trust in His goodness and faithfulness to turn things around for your good (Romans 8:28).