Samar bhai, I would request you in turn to look beyond Congress. As far as I think and as established by the recent general and assembly elections, people have booted out Congress out of power and we as citizens need to respect the mandate of the people who are supreme in a democracy (whether the mandate is to our liking or not).
Khan-gress is the most communal party - Article 370 (which played a key role in kicking out Kashmiri Hindus), Coining of the term minority (Instead of INDIAN), Reservation on the basis of religion, Haj subsidies, Sachar Committee report, Communal violence bill, opposition to Uniform Civil Code, etc. Appointment of people to top posts on the basis of their religion. The list is endless.
Coming to why BJP has not implemented Uniform Civil Code, I would give them some time before they can clear the mess left after more than 60 years of Khang-ress misrule and loot. Sarson hatheli pe nahi ugati - It takes time.