Why Isn't Deceit a Deadly Sin?

The Bible barely comes out against lying.

Or did I miss it? By all means quote me chapter and verse on this.

It feels like a sop. "Uh I guess we have to mention it, but let's get it over with as quickly as possible." It quotes exact percentages of thread to mix, exact genealogical ages, and gives you a very specific idea of how much skin to remove during circumcision, but glosses entirely over what counts as deception. 

Lying tongues are bad. Okay, what constitutes a lying tongue? Nothing specific, apparently.

Commentary should cover this gap, but doesn't. This is especially egregious since it sometimes (vaguely, handwavy) staunchly asserts that it's the Truth with a capital. 

P.S. Allow Caesar what is Caesar's? Okay. What is Caesar's? The only consistent interpretation is: nothing. Nothing is Caesar's. Is this deception? Because if it's not deception it's the instruction to submit to traitorous defectors if they have a big stick. 

P.P.S. It is extremely clear that the Bible is not the word of God. It is the word of some desert goat-herders.
These herdsmen happened to be significantly wiser than their neighbours...but that was never a high bar.
I dunno about you, but for me, "Better than the child-sacrifice cult," doesn't cut it as a minimum standard. 

P.P.P.S. The essence of morality is taking the long term over the short term. In the long term, Christianity leads to SJWs, so Christianity is immoral per se. 

P.P.P.P.S. Is the Pope in charge of Roman Catholicism? I don't think he is. If he wanted to fix these things, he couldn't.