“Are all sins equal to God?”
The word “equal” is meaningless without a context of some sort. For equality to signify anything, we have to ask the question “Equal in what sense?”
Let’s start with “equally deadly”.
A Holy God
God is perfectly holy. All sins of every kind are offensive to him. He is “of purer eyes than to see evil and cannot look at wrong”, as Habakkuk puts it. So telling lies is “equal” to murder, if only in the sense that either will cut us off from fellowship with a holy God and condemn us to an eternity apart from him. In this sense, all sins may be considered equally deadly. One is more than enough to seal our fate. It does not matter whether it is secret greed or public blasphemy against God himself.