Can one trust religion taught by sinners?

Reading the actual new covenant of God :-

Heb 8:8 For finding fault with them, he saith, Behold, the days come, saith the Lord, when I will make a new covenant with the house of Israel and with the house of Judah:
9 Not according to the covenant that I made with their fathers in the day when I took them by the hand to lead them out of the land of Egypt; because they continued not in my covenant, and I regarded them not, saith the Lord.
10 For this is the covenant that I will make with the house of Israel after those days, saith the Lord; I will put my laws into their mind, and write them in their hearts: and I will be to them a God, and they shall be to me a people:
11 And they shall not teach every man his neighbour, and every man his brother, saying, Know the Lord: for all shall know me, from the least to the greatest.
12 For I will be merciful to their unrighteousness, and their sins and their iniquities will I remember no more.

Thus all those under grace of the new covenant do not teach each other because God has put His laws in their mind and in their hearts of desire... they all know God already so have no need to teach each other.... read what God says and compare it to modern religion of sinners ...

all under grace are saints :-

1 John 3:8 He that committeth sin is of the devil

Saints do NOT teach saints then , but do teach sinners that they must give up sin before they can be saved from Satan's wiles:-

2 Timothy 2:19 Nevertheless the foundation of God standeth sure, having this seal, The Lord knoweth them that are his. And, Let every one that nameth the name of Christ depart from iniquity.

Thus Jesus says explicitly that he will take no-one who is still a sinner by his return:-

Luke 13:27 But he shall say, I tell you, I know you not whence ye are; depart from me, all ye workers of iniquity.

That seems too hard for most people to accept, and indeed it is , only few find the narrow strait way of saints in this life [Matt 7:14] , most go by the broad way of sinners to destruction in death

But note that not just the few are saved [Rev 7:3-8] , but after countless many are saved, and we know they came by the broad way of death as sinners in this world , yet Jesus says they are saved [Rev 7:9-10]

So when are most people saved , not the few at Jesus' return, but the countless many of those who go the broad way of sinners in this life ?

We know that those who go the broad way cannot live again until after the Mllenium :-

Revelation 20:5 The rest of the dead, lived not, until the thousand years, were ended.

Thus countless many of all nations are saved after the Millennium by their righteous life in the kingdom of God created during the Millennium [and the few were first only because they are the nation of priests and kings required to serve the many who will be saved after them]

2 Peter 3:13 Nevertheless we, according to his promise, look for new heavens and a new earth, wherein dwelleth righteousness.

The works of countless many in the new earth are thus righteous because of the few saved first and thus the many are saved by turning from sin to righteousness after resurrection from hell [Hades] , to be judged by their works and saved at judgment day according to God's law that those who turn from sin to rihteousness will live [no second death for sin for countless many then] :-

Ezek 18:21 But if the wicked will turn from all his sins that he hath committed, and keep all my statutes, and do that which is lawful and right, he shall surely live, he shall not die.
22 All his transgressions that he hath committed, they shall not be mentioned unto him: in his righteousness that he hath done he shall live.

This is the enduring mercy of God then , not unmerited forgiveness [grace] , but mercy on repentent sinners who stop sinning , and how most people are saved, not in this life, but the next :-

Revelation 20:13 ... death and hell delivered up the dead which were in them: and they were judged every man according to their works.