Drowning Is Often Inconspicuous To Onlookers
In most cases, raising the arms and vocalising are impossible due to the instinctive drowning response. Waving and yelling (known as "aquatic distress") is a sign of trouble, but not a dependable one: most victims demonstrating the instinctive drowning response do not show prior evidence of distress.
And regardless of the other commenter's religious beliefs, the bible doesn't mention an apple. You don't need to believe the stories to analyze them like any other fiction.
Gun: There is a direct correlation between the rises in stork populations and number of births in Germany. Therefore (according to your logic), storks bring babies.