1. If one commandment is not fulfilled there are always others as "backups".
2. Thoughts are influenced by actions.
3. Belief in the Exodus is one of the foundations of Judaism.

Incorrect. This does not explain why the Exodus is singled out for "spare parts" more than other concepts, neither does it explain the existence of the more than 20 commandments which commemorate the Exodus.

1. If one commandment is not fulfilled there are always others as "backups".
2. Thoughts are influenced by actions.
3. Belief in the Exodus is one of the foundations of Judaism.

The human mind is influenced by actions. A gentle person forced to participate in cruel activities will eventually become more callous, and similarly a cruel person forced to participate in acts of kindness will eventually become kinder.

The many commandments dealing with the Exodus deepen our understanding of it through actions that symbolize various aspects of the event and its Providential nature (Sefer Hachinuch).

1. If one commandment is not fulfilled there are always others as "backups".
2. Thoughts are influenced by actions.
3. Belief in the Exodus is one of the foundations of Judaism.

Correct. The Exodus, as it is described in the Torah, illustrates graphically many of the most fundamental of Jewish beliefs; Divine Providence, reward and punishment, free-will, prophecy, social justice, and the unique relationship between G-d and the Jewish people.