The reason for numerology is that ancient wise guys thought that 3, 5, 7 12, and such repetitious bible numers had some magic potential that could be used to count out the letters of names and such.
And they were about as correct about that as you seem to be - not so much, in other words.
"The Christian church, in its attitude toward science, shows the mind of a more or less enlightened man of the Thirteenth Century. It no longer believes that the earth is flat, but it is still convinced that prayer can cure after medicine fails." H L Mencken