King Ahaz engaged in a systematic campaign to dismantle the worship in the Temple and replace it with widespread idolatry. His actions went far beyond merely damaging sacred property; he actively sought to block access to the sanctuary and substitute the worship of God with an entirely new system. He began by gathering the holy vessels, taking them for his personal use and stripping them of their sanctity to treat them as ordinary objects [מלבי״ם]. Driven by a need for the precious materials they contained, he peeled and chopped away the gold plating from these sacred items [מצודת דוד, ביאור שטיינזלץ].
Taking his campaign even further, Ahaz shut the doors of the Temple. The primary approach among commentators is that his ultimate goal was to completely abolish the sacred service and physically prevent anyone from entering the grounds. By stopping the priests from performing their traditional duties, he intended to force them to officiate at the alternative altars he had constructed [רש״י].
These new altars were placed in every corner of Jerusalem, built with the explicit intention of angering God [מלבי״ם]. This aggressive attempt to entirely eradicate the worship of God created a devastating spiritual reality. The situation was only corrected later by his son, King Hezekiah, who reopened the Temple doors, restored the proper service, and repaired the deep spiritual damage caused by his father [רש״י, רלב״ג].