For a human religion to have TWO deities, the logical set would be a male and a female.
Why?
DUH!
Name a couple.
Batman and Robin, Burt and Ernie, Thelma and Louise.
Humans come in two sexes. Hence one of each is logical, two of the same sex is illogical and makes up question their sexuality.
That makes two Gods worse than either one or three. Father & Son + some ethereal spirit is a better combination than just Batman and Robin, the Green Hornet and Karo, Cisco and Pancho, Laurel and Hardy, Lucy and Ethel.
Anyone can see the sense in that.