I don’t hold my hands together like that to pray, though I was unaware of it’s ties to Hinduism. I’ve only seen people in paintings do that, or little children in movies. But then, I am not in a liturgical church that may teach things like that, though.
That mudra is the perfect balancing of the masculine and feminine within self. Consciousness flow through the hands alternates fingers on each hand so that when combined they are perfect balancing energy flow within self.
This is what facilitates hands on healing with prayer.