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.
What if the one that believers were believing in the true "Evil"? I find it hard to believe that a "God" would want to send those who lost faith in it to burn for eternity.
Of course they do, in my opinion, you are the fruit of experiences in your lifetime, anything and anyone that has a bond with you instinctively has an influence.