Evaluate the specific judicial doctrines and legislative history defining secularism in the Indian Republic:
1. The judicial branch applies the 'doctrine of essentiality' to delineate and protect only the core, foundational practices of a religion.
2. The explicit linguistic designation of 'Secular' was formally embedded into the Preamble via the 44th Constitutional Amendment Act.
3. The constitutional framework strictly mandates that all state policy must be totally devoid of any religious rationale or intervention.