you are correct in the sense when Jesus comes again, every eye will see Him in all His glory and everyone will know He is the Messiah. No NT will be required. no faith will be required. the only difference is that day will be judgement day and it will be too late to turn to Him for forgiveness of your sins. now is the day of salvation.
I am sorry but human sacrifice is forbidden. Blood sacrifice is not required. Dying on a cross is not a sacrifice...it is suffocation. His blood was not sprinkled on the horns of the altar. His fat and ofal not burned. Etc....not a sacrifice.
How will you know to recognize HIM? How will you know when to be looking for HIM? How will you know when judgment day is here?
Mt 24:36 “But of that day and hour no one knows, not even the angels of heaven,[e] but My Father only. 37 But as the days of Noah were, so also will the coming of the Son of Man be. 38 For as in the days before the flood, they were eating and drinking, marrying and giving in marriage, until the day that Noah entered the ark, 39 and did not know until the flood came and took them all away, so also will the coming of the Son of Man be. 40 Then two men will be in the field: one will be taken and the other left. 41 Two women will be grinding at the mill: one will be taken and the other left. 42 Watch therefore, for you do not know what hour your Lord is coming. 43 But know this, that if the master of the house had known what hour the thief would come, he would have watched and not allowed his house to be broken into. 44 Therefore you also be ready, for the Son of Man is coming at an hour you do not expect.
1 Thess 5: 1 But concerning the times and the seasons, brethren, you have no need that I should write to you. 2 For you yourselves know perfectly that the day of the Lord so comes as a thief in the night. 3 For when they say, “Peace and safety!” then sudden destruction comes upon them, as labor pains upon a pregnant woman. And they shall not escape. 4 But you, brethren, are not in darkness, so that this Day should overtake you as a thief. 5 You are all sons of light and sons of the day.
It is not our brethren in the house of Judah that are in darkness. They are the ones who are the sons of light that we are to be learning from lest we find ourselves as those that persished in the days of Noah.