Emulating the Kuffaar

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?