Practice of caste system is negligent among the educated, especially folks who come to US and in Indian metros (millions live) and most of the towns. It is still followed to some extent in 'redneck' villages in interior parts of India where one knows the other by name and caste. As far as entry into temples, all major hindu temples dont follow it or just dont care. Millions visit these temples each day. But, most of the incidents of late are more politically motivated than caste related. Current PM Modi himself is of lower caste. Also India and Hinduism is not uniform. Lower castes (designated as shudra in caste heirarchy) are called upper castes in south and hold political power. Its complicated.