What do you think of Native American indigenous spirituality?

Depends. Modern society tends to romanticize what that means, picking the pieces they like the best. Reality? There are lots of different tribes and practices. Some were very violent, and would not be acceptable by most societies today. It doesn't mean there aren't good parts, but it wasn't all good.

Every religious practice has aspects that don't hold up well in future ages. Do we ignore what we don't like? Or accept it?

I think there are romantisize aspects that are very appealing, but I can't ignore the parts that aren't.