What sense is hebrews critical of old testament religion?

The Book of Hebrews was written to Hebrew people who for the most part had accepted Jesus Christ as Savior, but because of persecution were contemplating going back to Judaism.

The writer of Hebrews takes them through a series of contrasts between being a follower of Jesus and having eternal life, verses, going back to Judaism and the law and ending up with nothing.

A true believer in Jesus will have eternal life after death, but if theydon't follow Him but at a distance, they will not grow or receive blessings, receive crowns or lay up treasure in heaven. In short they will enter heaven by the skin of their teeth. And their life will end miserably,( this is a once saved, always saved idea, but their is a very fineline to be seen).and if an unbeliever is thinking about following Jesus, but turns back from that idea, their chances for salvation is very, very slim.

Hebrews basically is saying, "Why do you want to go back into bondage to the Law, when Jesus Christ is offering you every thing? Jesus is superior in every way to what is in the Law.

Jewish people will argue and argue, but Christianity is an extension of Judaism.

Jews and Christians believe in the same God. The Jewish people are looking for the Messiah, but missed Jesus Christ when He came the first time. Christians are following Jesus Christ, the Messiah since He was on earth the first time. The Bible tells us that the Jewish people will recognize Jesus Christ at His Second Coming and will accept Him then as Messiah. This is the criticism in Hebrews.