You might be confused why blasphemy laws exist. Here’s the deal: God’s really important, and it’s important for us to be able to talk about God, and to pray to him using his name. But if we allow blasphemy, the word “God” might end up referring to something other than the actual God—sort of like how the proliferation of Santa myths has meant that “Santa Claus” no longer refers to Bishop Nicholas of Myra. This would be a disaster because we wouldn’t be able to talk about God, or pray to him, or reflect on how we should behave in light of what God is like.
The introduction here reminds me of the paper “Semantics for Blasphemy” by Meghan Sullivan, which I’ve heard summarized thusly: