Final answer:
The main claim is that King David is a man of God. Evidence supporting this claim includes witness testimony from Prophet Nathan and the existence of the Tel Dan stele, an archaeological artifact.
Step-by-step explanation:
The main claim is that King David is a man of God. One piece of evidence for this claim is the witness testimony of Prophet Nathan, who likely had first-hand experience with David. Another piece of evidence is the existence of the Tel Dan stele, an archaeological artifact that references the 'house of David' and attests to the existence of King David.