It all depends on the individual, we cannot foresee how we would react but, from my stand point, I say a large majority would accept the fact that they exist.
Humans aren't as stupid as some might say.
I had a vision... a very bad one and I feel like I will be the messiah of the cataclysm that will unveil the lies and destruct to rebuild a world where punishment shall be the only redemption to evil.