This is only 1 step removed from "We prefer only $religion here." Or another way to look at it, is "We dont like $your_religion." They aren't out-right saying that, but the dog-whistles are most certainly there, biblical quotes and all.
No matter how you shake it (by preference or by refusal), it's coming mightily close to breaking federal law as cited here: https://www.eeoc.gov/laws/types/religion.cfm
I would understand if the organization was a church or religious group. But it seems to be pretty bog-standard tech shop. It, at absolute minimum, is a warning sign of potential religious discrimination. To put it bluntly, unless there's a religious component in the nature of the job, the very fact that religion is mentioned on their pages is at best off-topic, a warning sign to all, and at worst a potential sign of EEOC violations.