3.How do we know that the worshipers were not made perfect?

By the fact that the offerings were made over and over again. This was true even of the great Day of Atonement.

If the blood of bulls and goats had the authority and power to remove sin it would not have been necessary for keep offering the animals. The worshiper no longer would have had any guilt concerning sin because the sin would have been gone.

The blood of animals was offered year after year, demonstrating that the blood of animals do not possess the power to remove sin from us.