Who is there to blame?

[Esquilax]

It's the testament of many of those who were slain because of their faith in him. I wouldn't do that if I was just perpetuating a fraud.

Okay, you need to drop this argument entirely: it is one of the most profoundly blinkered, incorrect arguments christianity has ever produced. See, the world you're positing is one where christianity is true, and therefore all the other religions are false. Those religions all have martyrs who died for their faith.

Even in the premise of your argument, you still live in a world in which people die for their misplaced faith; simply eliminating fraud from the picture doesn't make the claims of those people any stronger.