Ephesians 6:16 I Shall Buckler
The Hebrew word for the shield in the Old Testament is Magen. Some people believe when David was writing about a shield (Magen) in the book of 2nd Samuel and the Psalm, he was referring to the Star of David. But the Lord told Abram (Abraham) that God would be his shield.
2 Samuel 22:36 You have also given me the shield of Your salvation, And Your help makes me great.
But it is doubtful David would put his trust in the symbol before the omnipresence of the Lord God. Remember, David faced the giant Goliath with no physical armor. But Goliath had a shield, and someone carried it for him.
So it is doubtful David put his faith in a six-pointed star. The shield of faith does not need to be seen, nor are the fiery darts from the evil one. Temptation happens, but it is a person’s genuine desire. Look at anyone with lust, adultery begins in the heart, and the flesh will lead to committing sexual immorality. Many people wear a cross; some are Christian some are not. Ozzy Osborne wears a big cross necklace and puts a cross symbol on his album covers, but he calls himself the Prince of Darkness. Jimmy Lee Swaggart preaches and sings gospel music proclaiming to be a televangelist for the Lord. But sexual immorality made the Assemblies of God denomination remove Jimmy from his pastoral role. Of course, David gave into the sin of adultery. He even had the husband of the woman he had his affair with murdered in battle. But David repented earnestly to the Lord about his wrongdoing, asking the Holy Spirit to restore the joy of salvation.