“Behold, I Myself am going to bring a sword on you, and I will destroy your high places [of idolatrous worship], and your altars will become deserted and your pillars for sun-worship will be smashed in pieces; and I will throw down your slain in front of your idols [that cannot bring them back to life]. [Lev 26:30]”

~ Ezekiel 6.3-4 AMP

Who is on my altar? Is it God AND ONLY God? Or do I see money on there, too? And other idols?

"Do not worship any other god, because I, the LORD, tolerate no rivals." (Exodus 34.14 GNB)

See: Altars