Can you replace the question mark with the correct number?

Sherlock breaks into a crime scene. The victim is the owner who is slumped dead on a chair and have a bullet hole in his head. A gun lies on the floor and a cassette recorder is found on the table. On pressing the play button, Sherlock hears the message 'I have committed sins in my life and now I offer my soul to the great Lord' and followed a gunshot Sherlock smiles and informed the police that's its a murder.

Why did he think so?

What occurs twice in a week, once in a year but never in a day?

Can you name four days which start with the letter 'T'?

Which is faster, Heat or Cold ? Explain.

I am the first thing you need while camping.
I am always with the person named Marcos Valencia and Carrick.
But Pogba Zlatan and Rooney think I am wasteful and do not need me.
I am the second to the last thing to add when you are making a patch.

What am I?

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

Who has married many women but was never married?

'S' refers to the number of seconds in a day and 'H' refers to the number of hours in ten years. Which quantity out of these two is greater?

What have one eye but still cannot see?