Hosea 10:2

‘Their heart is divided (or ‘smooth, deceitful').

Now will they be found guilty.

He will smite their altars,

He will destroy their pillars.'

But Hosea warned that it would not go on for ever. Their hearts were divided between YHWH and Baal, with YHWH demoted to a mere nature god, and as a result they were about to be found guilty, guilty of dishonouring and ignoring YHWH's covenant and His special claim on them. And as a consequence He was about to smite their altars and destroy their pillars. For He had not overlooked Assyria. Indeed He was about to use Assyria as the rod of His anger (Isaiah 10:5).