By Saurabh Sharma and YP Rajesh AYODHYA, India (Reuters) – A grand temple to Hindu god Lord Ram opens on Monday on a site in India millions believe is his birthplace, in a religious spectacle led by Prime Minister Narendra Modi months before he seeks a rare third term in elections. The construction of the temple is a 35-year-old, central promise of Modi’s Hindu nationalist Bharatiya Janata Party (BJP) and a contentious political issue that helped catapult the party to prominence and power. Hindu groups are portraying the inauguration ceremony in the northern city of Ayodhya as the peak of Hind…