Surely it the religious with their purported deity looking out for them who are much more likely to develop a delusion of invincibility.
And why would that be, PD? After all, is it even true to say that their 'purported deity (is) looking out for them'? Just what do you even mean by ' ... looking out for them' in this context? Doesn't the rain fall and the sun shine on all humanity equally? Does God only perform miracles in the lives of those who believe in him? Biblically, that never happened; instead, a miracle was just the opening for Jesus to explain to people who he was and what his purpose was.
So many questions leading from such an un-thoughtout assertion.
Surely the notion that you believe that when you die you don't actually die but live on in paradise is just about the most extreme example of an 'invincibility delusion'. I can't think of anything more extreme in that way. If that isn't a deity looking out for you then I don't know what is.
For non believers we completely recognise that death is death, the end, finality, - we recognise that we aren't invincible. Those with religious belief (specifically christian) think otherwise, that death isn't the end, that death has been defeated, that they are, therefore invincible and cannot really die.