Nobody is born as a sinner. Every individual is born as divine. But due to various attahcments, egoism and materialisic attitudes we donot realize this just as a cloud covers the sun.
The objective of human birth is to REALIZE this divinity in us. (Please donot confuse many of the people in the forum who are already confused by people arguing with little knowledge on Sabarimala)
On a pure Vedanta, ban on entry of women would seem as discrimination on the basis of the body since The Atman is just the Manifestation of the Supreme.
But you have to respect the traditions of the holy place. Afterall women are barrerd only in that sopecific Ayappa temple not in lakhs of temples elsewhere in the country.