I take it you have no idea what an 'angel' is or even what the name means?
The word comes from the Greek New Testament Bible and simply means 'messenger.' Before technology created an inferior substitute for it, intelligent and perfectly 'rational' people used to have powerful conversations over thousands of miles using 'messengers.' They weren't anything like our silly mail services. They were troupes of well trained actors who would play out the 'message' over and over again in front of the sender until they captured the exact emotion and meaning intended for the recipient. Then they would deliver the powerful message, which was the equivalent of all of the stupid infantile text messages you have ever sent or even will send during your life, only meaningful beyond modern descriptions.
In response, the recipient would allow the impact of the message to sink in, allow every emotion it engendered to have its full effect, then begin a return message. The result of this type of communication was the greatest art, poetry, drama and social genius the world has ever seen. It remains the standard of 'genius' today, with no one alive capable of doing anything remotely like it except for poorly emulating it after paying large sums of money to study it in schools.
That all said, these same brilliant people fully believed in the existence of GOD because they directed the same kind of 'messages' to Him, only they used the power of their imagination to play out dramas that captured all of the intense emotion of their most deeply held beliefs, questions, concerns, and collective thoughts. Then they 'waited' for a response, which actually arrived in that same form.
This is also known as 'dynamic prayer.' Instead of poorly coded graphics, their own minds were flooded with powerful visions, dreams, art and emotions which also sparked new 'messages' for each other.
The divine 'acting troupes' are known as 'angels.'
I am a Christian mystic and I 'converse' with them routinely. There is nothing 'irrational' about it. The world's greatest artistic and social genius, including the grand institutions and social models of the 'modern' world which you now take for granted, were received by 'nobodies' like myself as we devoted our time to this art form inside the original Christian 'university' system. Without it, you would most likely still be a slave living under oppression inside an obscure tribe someplace on earth.