Q24: How are these articles divided?

Into three parts:

the first is about God the Father and our creation; the second about God the Son and our redemption; the third about God the Holy Spirit

and our sanctification.

Q25: Since there is only one God,1 why do you speak of three persons, Father, Son, and Holy Spirit?

Because God has so revealed himself in his Word2

that these three distinct persons are the one, true, eternal God.