Kufr

Q: Kindly provide a response on the following: In today's times, with more and more people watching hindi movies, their ways are being practiced by Muslims. What are the consequences of a person bowing down to another person, like how the hindus do it - going down on their knees, with head bowed over (almost touching the ground) and touching the feet of the person? Does the Muslim person become a Mushrik? If yes, then does the nikah of that person break? How should such a person make towbah?

س: هل سب عائشة (رضي الله عنها) أو طعن في شخصيتهاأوالقول بأنهاإمرأة فاسقة(و العياذ بالله) - يكون كفراًً؟

Q: I suffer from a lot of waswas about kufr. So sometimes I utter the Shahada to calm my mind. Does this affect my Nikah? If I hadn't actually comitted kufr but uttered the Shahada out of fear I had comitted kufr, would I consequently have to renew my Nikah as well? Sorry if you find the question strange, but these kind of things are in my head.

Q: Do the Shias really say that our Qur'an is altered? If so, do they still remain as Muslims?