It really seems like the mc's constant indecisiveness is just to drag out suspense rather than reasonable doubt. I have no idea why he would want to kill that captain, seems like a terrible idea. Like, literally directly opposed to what his goals are. The best thing for him to do is frame himself as a god opposed to the ruling gods until he had the power and opportunity to expose the fake gods and earn support. If he were to kill people then he would just taint his image when the time came. Serving as a foil to Athena is just a 1D solution to the problem. He has the opportunity to control the narrative from multiple angles, he needs to take advantage of it. Maybe I'm just missing some aspect of his plans. Also, Athena is obnoxious. Just like some braindead harem girl.