Jeremiah 39:15-18 ESV
The word of the LORD came to Jeremiah while he was shut up in the court of the guard:  "Go, and say to Ebed-melech the Ethiopian, 'Thus says the LORD of hosts, the God of Israel: Behold, I will fulfill my words against this city for harm and not for good, and they shall be accomplished before you on that day.  But I will deliver you on that day, declares the LORD, and you shall not be given into the hand of the men of whom you are afraid.  For I will surely save you, and you shall not fall by the sword, but you shall have your life as a prize of war, because you have put your trust in me, declares the LORD.'"
This is what God now says to us saints under the New Covenant:
'I will fulfil my words against this WORLD for harm and not for good, and they shall be accomplished before you on that Great Day, the Day of Judgment.
But I will deliver you on that Day, and you shall not be given into eternal judgment, of which you are afraid.
For I will surely save you, and my wrath will not fall upon you, because you have put your trust in my Son!"
In the above passage, God was speaking to an Ethiopian, a Gentile. It shows that, even under the Old Covenant, it ultimately didn't matter who you were or what was your background. It didn't matter if you were the king, the high priest or the prophet. On the day when the Babylonians finally invaded Jerusalem, those who were merely Jews on the outside, but actually did not trust in God as their Saviour, were slaughtered by the wrath of God.
But this Ethiopian, though he looked nothing like a Jew on the outside, was a Jew on the inside, accepted by God, because of his FAITH in God:
Romans 2:29 ESV
But a Jew is one inwardly, and circumcision is a matter of the heart, by the Spirit, not by the letter. His praise is not from man but from God.
Acts 15:9 ESV
 and he made no distinction between us and them, having cleansed their hearts by faith.
In the same way, the only thing that will matter on the Day of Judgment is: did we trust in the Son to save us from the wrath to come? It will not matter our heritage, whether you were born in a Christian family, or in a "Christian nation", or not. It will not matter if you were a member of a church. It will not matter if we were one of the 'influential people' in this world, or whether or not we were pastors in full time ministry, or whatever we did 'in Jesus' Name'.
Only one question will matter on that Day: Did I TRUST in Christ to save me on that Day? Or did I trust in who I was or what I did?
But this is interesting: "You shall not be given into the hand of the men of whom you are afraid". Which means: the Ethiopian DID trust in God that He will deliver him from death, according to God's own assessment, BUT he was still fearful of the Babylonians!
Perhaps it was because he was a servant in the king's palace, and so he could not desert to the Babylonians, even if he wanted to do. This eunuch knew that he could not physically obey this commandment of God, even though he believed it with all his heart: Jeremiah 38:2 ESV
"Thus says the LORD: He who stays in this city shall die by the sword, by famine, and by pestilence, but he who goes out to the Chaldeans shall live. He shall have his life as a prize of war, and live.
And yet, even though this Ethiopian was not able to obey this commandment, he was still given an assurance of salvation. Why? Because whether a person physically stays in the city or not, what God was looking for was: did this person truly BELIEVE my words or not?
Thus what we observe here is that saving faith is not one that is required to be so perfect that it rids the person of ALL fear of judgment. No one has such perfect faith. Like this Ethiopian, we trust in Christ to deliver us from the eternal wrath of God on that Great Day. But we may still be terrified that we might be eternally condemned on that Day. That may be because our obedience to God's commandments, that springs forth from our faith in Christ, is not perfect. Because of our various weaknesses and limitations, there may be many 'holes' in our obedience.
But what Christ is looking for is that mustard seed of faith. He is looking for a faith that struggles: Mark 9:24 ESV
Immediately the father of the child cried out and said, "I believe; help my unbelief!"
Jesus understands that our faith and the resulting fruits of obedience will not be perfect. But thank God that we are not saved by our obedience nor even by our faith itself, but by CHRIST and what He's done for us.