Oh good grief. That expression was specific in context to your Declaration.
" Before final approval, Congress, having made a few alterations to some of the wording, also deleted nearly a fourth of the draft, including a passage critical of the slave trade."
" At that time many members of Congress, including Jefferson, owned slaves, which clearly factored into their decision to delete the controversial "anti-slavery" passage. In 1776, abolitionist Thomas Day responding to the hypocrisy in the Declaration wrote:
If there be an object truly ridiculous in nature, it is an American patriot, signing resolutions of independency with the one hand, and with the other brandishing a whip over his affrighted slaves."
Context, people, context. The phrase is specific to the declaration, not a universal saying applicable in all aspects and situations.
Is a person who has spina bifida created equal in physiology to someone who was born blind? Nope.
Are they equal, when born, to certain inalienable rights, including the pursuit of life liberty and happiness?