About 9 years ago, when I was looking for progressive rock bands that were Christian in orientation, I first found out about Kerry Livgren’s work both with Kansas and then with Proto-Kaw and his solo work:
Afterwards, I discovered Ajalon:
Then I discovered Glass Hammer:
A few years after that, progressive rock giant Neal Morse became Christian (although he kind of misunderstands what the Trinity is all about; his views sound like a mix of tritheism and modalism):
It doesn’t really do any justice by just watching these clips. Keep in mind that Christian progressive rock (like secular prog) is known for suites and concepts albums so it’s always best to listen to entire albums to understand the big picture i.e. the love of God manifested through Jesus Christ.