ANSWER:

He should have kept his breath until he suffocated and died!

What kind of a question is this? Is breathing now becoming one of the means of disbelief?

You can’t be talking about Islam, the religion of ease and simplicity. You are confusing it with another religion! 

QUESTION: A person regrets how he is not standing for that which is halal, and sinning. A thought crosses his mind that how blessed Arabs are that their cultures is surrounded by Islam and he and his family’s is not. He was about to breath out(in regret),but stops, as he realises it’s wrong، however he still breath out(not to show regret). Is it kufr?/what if he did intentionaly breath out?