Contradiction with Exodus 20:4
2 Kings 16:12 describes the king's approval of an altar, which contradicts God's commandment against making graven images or altars for worship.
Exodus 20:4: Thou shalt not make unto thee any graven image, or any likeness [of any thing] that [is] in heaven above, or that [is] in the earth beneath, or that [is] in the water under the earth:
Contradiction with Deuteronomy 12:31
The verse contrasts with 2 Kings 16:12 by emphasizing that God's people should not worship in the same manner as the nations, implying disapproval of adopting foreign altars.
Deuteronomy 12:31: Thou shalt not do so unto the LORD thy God: for every abomination to the LORD, which he hateth, have they done unto their gods; for even their sons and their daughters they have burnt in the fire to their gods. [to the: Heb. of the]
Contradiction with Matthew 6:24
This verse indicates serving two masters is impossible, conflicting with 2 Kings 16:12 where allegiance to God is compromised by adopting foreign worship practices.
Matthew 6:24: No man can serve two masters: for either he will hate the one, and love the other; or else he will hold to the one, and despise the other. Ye cannot serve God and mammon.