Ahaz was a wicked king of Judah. He offered his son in the fire. "And he sacrificed and made offerings on the high places and on the hills and under every green tree" (2 Kings 16:1-4). Rezin and Pekah challenged him in war, besieging Jerusalem. Rather than call on God, as Isaiah encouraged him, he summoned help from to Tiglath-Pileser of Assyria. Ahaz gave temple treasures to Tiglath and promised servitude. Tiglath came to the rescue, and God was forgotten.
Ahaz went up to Damascus to see Tiglath. While he was there Ahaz saw the altar that was at Damascus. And King Ahaz sent to Uriah the priest a model of the altar, and its pattern, exact in all its details. And Uriah the priest built the altar; in accordance with all that King Ahaz had sent from Damascus, so Uriah the priest made it, before King Ahaz arrived from Damascus. And when the king came from Damascus, the king viewed the altar. Then the king drew near to the altar and went up on it and burned his burnt offering and his grain offering and poured his drink offering and threw the blood of his peace offerings on the altar. And the bronze altar that was before the Lord he removed from the front of the house, from the place between his altar and the house of the Lord, and put it on the north side of his altar. And King Ahaz commanded Uriah the priest, saying, “On the great altar burn the morning burnt offering and the evening grain offering and the king’s burnt offering and his grain offering, with the burnt offering of all the people of the land, and their grain offering and their drink offering. And throw on it all the blood of the burnt offering and all the blood of the sacrifice, but the bronze altar shall be for me to inquire by.” Uriah the priest did all this, as King Ahaz commanded. (2 Kings 16:10-16 ESV. Note that the NASB uses Urijah, while ESV uses Uriah.) Here is an addition, plain and simple, unauthorized, presumptuous, and exceedingly sinful.
Ahaz was wicked; Urijah knew his wickedness. When the king ordered a new altar and set aside God's bronze altar, spineless priest Urijah went right along with him. The king was wicked, but the priest should have known better and should have maintained the integrity of the temple. He could have said no the Ahaz; he never even lifted his voice in protest to the shameless altar of Ahaz.
There is another priest, whom we can respect and should imitate his faith.
When Uzziah became strong and his heart proud, he acted corruptly and was unfaithful to the Lord his God, " for he entered the temple of the LORD to burn incense on the altar of incense. Then Azariah the priest entered after him and with him eighty priests of the LORD, valiant men. They opposed Uzziah the king and said to him, “It is not for you, Uzziah, to burn incense to the LORD, but for the priests, the sons of Aaron who are consecrated to burn incense. Get out of the sanctuary, for you have been unfaithful and will have no honor from the LORD God.” But Uzziah, with a censer in his hand for burning incense, was enraged; and while he was enraged with the priests, the leprosy broke out on his forehead before the priests in the house of the LORD, beside the altar of incense. Azariah the chief priest and all the priests looked at him, and behold, he was leprous on his forehead; and they hurried him out of there, and he himself also hastened to get out because the LORD had smitten him. King Uzziah was a leper to the day of his death; and he lived in a separate house, being a leper, for he was cut off from the house of the LORD" (2 Chron. 26:16-21).
Azariah was God's man and a faithful priest; Urijah the priest cowardly gave in Ahaz's self-made religion. He was perhaps more unfaithful to God than Ahaz, because he never lifted his voice against the sin. Whether you sacrifice on your own initiative or you add your own altar or add an instrument, you become unfaithful. When you are unwilling to speak against sin and presumption, you become just as guilty. Are you an Azariah or a Urijah?
Oh, by the way, Hezekiah cleansed the temple of Ahaz's unclean things (2 Chron. 29:5-13) and restored the utensils that Ahaz threw out. I wonder if indeed there are some things today that ought to be thrown out of God's holy place. Hezekiah and Azariah showed faithfulness by saying no to self-made religion.
for more see: http://www.god-answers.org/Online_Tools/books/Music_in_NT_Church.pdf