Is not telling the truth morally wrong from a divine command perspective?

IT depends on the divinity involved. Think about that. What about telling a half-truth? Again, it depends on the divinity invoked.
I know religious teachers who lie, cheat, and steal: It is rationalized by them as ok with God because it is for the greater good. I remember a Pastor I had who told me a "white" lie, and I knew it, and said that is a lie. He chastised me for not letting him try to alleviate a touchy situation in the church (an associate pastor who got into a sleazy sexual relationship with a church worker). So the answer you get, as I stated, depends on the divinity involved.