Welcome, Lunarlara,
When they come around asking just state that you have determined that this organization is not for you. Nothing more. It is none of thier business anyway.
Excellent advice . 40+ wasted years for me. They are trained to try to draw out and overcome your objections. So they may ask for just one thing. If you don't want the upset feeling of confrontation, don't even open that door by offering any reason. If you appear the least bit unsteady about this, they will be hard to get rid of. BE FIRM!
Long live the internet. You are another example of why the Watchtower headquarters tells the congregation members to avoid research.
B