Can facilitated communication with an autistic person be enhanced by asking Creator’s help through prayer? If so, would bringing this awareness to the autism community be a benefit?

Again both are true and very, very important to foster. If the best way to achieve true communication depends on divine intervention, requesting this openly and actively, and by people of faith who believe in the Divine, will bring desired results. And will be not only a blessing but a further demonstration and validation of the truth of the Divine and can be a shining example of divine grace through the prayerful outreach. This is an object lesson worth teaching and will be a boon, not only to the autism families, to the families of those with autism and their caregivers, but to many who are in doubt about the reality of the Divine and need a reason to believe once again.