Catechisms are a way of educating children religious ideas, and are usually written in question answer form. They began to be popular in the later Middle Ages, and the Longer and Shorter Catechisms of 1647 and 1648 are used in Presbyterian Churches

In Chapter 7 of Anne of Green Gables, Marilla asks Anne what she knew about God, and Anne responds with a catechism quotation:

“Don’t you know who God is, Anne?”
“`God is a spirit, infinite, eternal and unchangeable, in His being, wisdom, power, holiness, justice, goodness, and truth,’” responded Anne promptly and glibly.’”

In Chapter 14 of Anne of Avonlea, Anne catches Davy stealing plum jam, and this results in a conversation where Davy claims the catechism promises there will be jam in heaven!

“Anyhow, there’ll be plenty of jam in heaven, that’s one comfort,” he said complacently.

Anne nipped a smile in the bud.

“Perhaps there will. . .if we want it,” she said, “But what makes you think so?”

“Why, it’s in the catechism,” said Davy.

“Oh, no, there is nothing like THAT in the catechism, Davy.”

“But I tell you there is,” persisted Davy. “It was in that question Marilla taught me last Sunday. `Why should we love God?’ It says, `Because He makes preserves, and redeems us.’ Preserves
is just a holy way of saying jam.”

Here is the Shorter Westminister Catechism.

(excerpt)

Question 4. What is God?
Answer. God is a Spirit, infinite, eternal, and unchangeable, in his being, wisdom, power, holiness, justice, goodness, and truth.

Click to read more ==> The Westminster Shorter Catechism

Source

http://www.ccel.org/ccel/schaff/creeds3.iv.xviii.html