Well, I am one of Jehovah's Witnesses, so I'd like to comment.
First of all, MsKanga, when we are out and see ANY property with a "NO TRESPASSING" sign, we don't go on that property. Period. I don't doubt that you do have a sign on your property, but possibly they didn't see it. We (Jehovah's Witnesses) are told not to go on any property with a NO TRESPASSING sign, unless of course invited there by the propery owner. On behalf of whoever was at your door this morning, I apologise. (I'm assuming they were Jehovah's Witnesses, since you mentioned the magazines. lol) I don't know why they would enter your property in the first place, let alone proceed to your back door. This is not something that Jehovah's Witnesses normally do, or should do.
Secondly, there are a LOT of people out going door to door, which have been mistaken for Jehovah's Witnesses. There are groups of people out there who *claim* to be JWs, but who are not. It's hard for someone who is not familiar with our religion to really know for sure. As a general rule, we go door to door in our *own* towns, and often surrounding towns, but never far from home (unless visiting with another congregation).
Thirdly, we do like to engage in conversation with people of *all* religious backgrounds, so I'm not sure why someone told pjlla that they wouldn't want to listen to her/him speak about his/her beliefs for 10 minutes. LOL
And lastly, here is the reason why we do go door to door. It's based on what Jesus told his followers, and doing what his disciples did in the first century:
"And every day in the temple and from house to house they continued without letup teaching and declaring the good news about the Christ, Jesus." (Acts 5:42).
There are other scriptures, too, which further show this command given by Jesus, but just wanted to explain specifically the "house to house" part
Anyway, I don't/won't debate my beliefs, and I absolutely acknowledge everyone's right to their own beliefs, but I just wanted to comment on what was being said. Again, I apologise for any aggravation or inconvenience, but Jehovah's Witnesses do have excellent reasons for what we do, and we do care about our neighbors and the world in general.