Of course. I was trying to say he could have worshipped the Nameless One. Or is it another name for the Primordial Truth?
Primordial Truth= Chaos Nameless One = Massive Warp Entity that is older than the Chaos Gods, and most likely older than the Materium itself.
The Nameless One cares not for worship, only for victory. Regardless of what Lorgar chose to worship, he saw the Truth.