Ahmed Abdul Jalil has spent most of his life tending to a place of worship in Aden, the port city in southern Yemen. Yet it is not one of the mosques that Muslims like him attend regularly across the country, but rather a Hindu temple. Snuggled in a cave in the foothills of a volcanic mountain in the Khussaf Valley in Crater, a historic district of Aden, it was built more than 160 years ago to be the largest among 11 Hindu temples and Sikh gurdw…