Welcome Lunalara! I also really hate a confrontation like that. It is part of growing strong and coming into being your own person. Be true to yourself. Like salesman they are trained to play on your emotions and fears and argue you down. Don't let them get started. Just state what you want and tell them to please not come back. Or put you on a do not call back list. You don't have to get angry or mean, or argue, or put up with anything to be polite. You are being polite just by telling them and not making them come back time after time as you hide from them.. You have a right to your decision, and to not allow anyone access to you you do not want to try and sway you. You could also do something that happened to me when I was a JW: I came for a Bible study and the book was on the doorstep outside.I got the hint. (You could also leave a nice note telling them not to return.)
By the way. Since you seem to be drawn to the Bible...The Bible says True "Religion" that is pleasing to God is caring for orphans and widows. (Even the JW Bible says this!) Religion is an outward expression of your beliefs. Start with a relationship with God. You and Him. Read the Bible for yourself.You don't have to stress or worry, or take orders from an organization. Your "religion" will follow your belief. The truth will set you free in many, many ways.
Best wishes in getting completely free from the briar patch!