This is a renowned movement from Bach's Cantata BWV 80, known for its vibrant energy and masterful fugal writing. It vividly portrays the text concerning faith and divine protection.
Mastering the rapid passagework and intricate fugal entries requires exceptional finger control and stamina.
Alles, was von Gott geboren (BWV 80a) is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 8.
You should be comfortable at Henle level 4 — meaning you can already play level 3–4 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
A typical performance of Alles, was von Gott geboren (BWV 80a) lasts about 6 minutes.
Alles, was von Gott geboren (BWV 80a) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.