Lex had long ago learned how to manipulate divine energy, but it was scarcely useful except against Ra. There was also the fact that Lex could not produce divine energy out of thin air, and his only source was the Butter Knife. He typically avoided using it, since the divine energy from his mask and knife would only replenish based on the people who followed the Deity of the Butter Knife, and the Invincible Tyrant.
But it was better to get the hang of it before he needed it, so now was as good a time as any. The first part of using divine energy was to enhance his body and his attacks, and only the second level of using it was to make use of its completely magical properties to bring about various changes.
Unlike Cornelius, Lex did not have any Lawcrafts that he already knew how to construct, so instead of overwhelming changes, he was going to use divine energy to subtly affect the world around him.