'This is the ability he uses to sense and hunt down evil and unholy opponents, it allows him to sense undead, demons, spirits and other creatures considered inhuman or unnatural to a 'human' God.' 

At which point he has a fair estimation of your character's ability, by activating the ability by praying to his god in one of my earliest posts, though it's obviously not perfect as he didn't single your character out to be attacked, he dealt with the first enemy he saw. The only person with apparent omniscience is your character and his spirits, on top of his other abundance of abilities. 

He can't actually know your character is preparing some magical ability, which is why it's not said in my post, but he would note an increase in your character's 'unholy' presence (this is to his perception, it really doesn't matter how you describe your power, this is just how my own character's power interacts with it.) Which would have the effect of increasing his desire to end the threat quickly, which I believe I made apparent in my posts.

Regardless, all moot, point is you can't blame me for killing the conversation when you started charging magical attacks before we even met.