And it's a BIG difference.
in the Apostolic Church we pray to the Triune God, the God of Abrahama, Isaac and Jacob. What does the OPC sub-group the DEPC pray to — it doesn’t pray to the Christian God, presumably it prays to some strange vengeful deity like Mammon (word-of-faith group, eh?)
When it comes to Catholic doctrine, apparently not. And when it comes to God...
The god of Calvinism is a god of blood feud perpetuating sin, visiting his wrath on all but those he chooses capriciously. He creates beings who hate him in the womb, then forces some to "love" him and be grateful to have been "saved" from his wrath.
This is closer to the pagan god than the God of Jesus and Christianity.