Can non-Catholics pray to God?
From True Devotion to the Blessed Virgin, by Louis de Montfort:
Louis de Montfort describes, very succinctly, the disposition of a pious Catholic:
"...These devotions are a wonderful help for souls seeking holiness provided they are performed in a worthy manner, that is:
(1) With the right intention of pleasing God alone, seeking union with Jesus, our last end, and giving edification to our neighbour.
(2) With attention, avoiding willful distractions.
(3) With devotion, avoiding haste and negligence.
(4) With decorum and respectful bodily posture."