Emulating the Kuffaar

Q: There was a fun run race this past month that is called colour run. Basically the people run a fun run where along the way colour powder gets thrown at the runners. This is a global event which is now becoming prevalent in the Muslim community. The purpose as per their website is celebrating healthiness, happiness and individuality. I would like if Mufti can maybe give a general view on the harms of doing such races and also expanding on the nature of which this is similar to a Hindu custom (Holi)?

Q: From the below ibaarat it is understood that the following two things will be with tashabbuh:

1) قصد (to be مشابه)

2) ميلان

So if the any of the above is not found this will not be tashabbuh. Is this correct?

Q: What does emulating the kuffaar mean? Is it only confined to clothing or does it also relate to other aspects of one's life? We see the kuffaar driving cars and eating and drinking in plates and cups and we Muslims also do the same. Is this not also emulating the kuffaar in our actions?

Q: Is it permissible to say cheers (as is the habit of the kuffaar at the end of a conversation)?

Q: I want to know that if a Muslim lady puts colourful bindi on the forehead just for looking good (not red bindi). Is it permissible in islaam?

Q: Is wearing black thread on waist Hindu culture? Do Muslims wear it? If a person wants to wear it because he likes it not for buried nazar can he wear it? Can Muslim men wear belly chains?

Q: What does emulating the kuffaar mean? Is it only confined to clothing or does it also relate to other aspects of one's life? We see the kuffaar driving cars and eating and drinking in plates and cups and we Muslims also do the same. Is this not also emulating the kuffaar in our actions?