Full Idea
God is attainable in pure speculative knowledge alone and is only in that knowledge, and is only that knowledge itself, for He is Spirit; and this speculative knowledge is the knowledge of revealed religion.
Gist of Idea
The God of revealed religion can only be understood through pure speculative knowledge
Source
Georg W.F.Hegel (Phenomenology of Spirit [1807], p.461), quoted by Stephen Houlgate - An Introduction to Hegel 04 'Absolute'
Book Reference
Houlgate,Stephen: 'An Introduction to Hegel' [Blackwell 2005], p.100
A Reaction
If you were hoping to find out why Hegel believed in God, I fear this is the best evidence available. He is evidently opposed to natural theology. Hegel's language makes it very hard to grasp how we sees the nature of God.