"sinners in the hands of an angry god."in this excerpt, “natural” is used to describe people who

The word "natural" in the excerpt "Sinners in the Hands of an Angry God" is used to describe an individual who have not been touch by the spirit of God. 
("So, it is that NATURAL men are held in the hand of God, over the hole of hell, they deserved and are sentenced to the fiery pit".)

In this excerpt, the word "natural" is used to describe people who have not been touched by the spirit of God. You know this because later in the excerpt it says "and they have done nothing in the least to appease or abate that anger.."

The details about the statues, i believe, are that they're carved from blocks of igneous stone, many of them are partially buried under the ground which to preserve and protect them from the harsh environment on easter island, and many of the facial features have washed away. also, the most well-preserved one is at the british museum in london.these are just guesses from what i can see and what i think i read correctly. i'm sorry i couldn't be more .