Nah. I'd say the Christian God has a stronger case going for it than a little leprechaun. There's an entire religion and a massive social movement around the idea of the Christian God. Not so much a leprechaun. The movement having started from people's experiences with Jesus.

And on a personal level, I think religion was a great thing to have around, regardless of whether I believe in God or not.

The Fear of God kept people in line. Everything's been degenerating since the rise of secularism.