And who is God referring to in that passage? And when?
Reveal himself to you how? How do you know it's God? 2 Cor 11:14 "...even Satan disguises himself as an angel of light."
I dont know how God will choose to reveal himself to you. He stands at the door and knocks. Do you think He would not come in if you opened the door? I dont believe he would allow satan to answer a prayer like that. Would he give you a stone if you asked for bread?
Whose are they? Klingons'?
As we are discussing whether they are God's creations or Man's creations, and you allege they are Man's, and I am stating they are not, then clearly I think they are God's creations. And as these are communications from God, then to be effective communications, people would have to relate to them. Therefore there is a cultural influence. QED.
And how am I to know it is God?
How do you know what God would do? In the OT God sends deceiving spirits.