Santa singh in story writing competetion

Santa Singh happened to participate in a competition, which was about writing the shortest story. The organizers had put a condition that a story must have four ingredients viz. religion, sex, suspense and mystery. Santa singh turn came after many attempts by others. Santa gave a story, which was just one sentence and read:
“Oh God, my wife is going to deliver a child“.
Ostensibly amused, the organizers asked Santa whether it contained all the four ingredients!! Santa replied affirmatively and gave his explanation as below:
Oh God: religion
my wife: sex
going to deliver a child : suspense (whether a girl or a boy)




“Okay…. but where is the mystery ?” asked one of the organizers.
Our Santa Singh replied : Who is the father ??