I have a cousin who got a master's degree from GCU. No idea why she chose them because they were way more expensive than most other places and she has had a hard time finding positive gainful employment in her field.
IMO, you are better off just going to a community college and then a state school.
The Christian angle is an interesting one. I cannot speak directly to that because I have never been there as a student. But we do need to keep in mind that GCU is a *very costly* and *for-profit* business that uses the "Christian" label. GCU seems to have realized that Christianity sells and there is money to be made by affixing the Christian label to their business.