Poltergeist Or A Spirit Meaning No Harm?

For the past several months my parents and I have been experiencing several things in our home. We have seen figures of people and animals. There has been many of times where there has been large orbs flying across the lounge and my parents' bedroom.

I've heard groaning noises and whispering in my ear in bed and had the covers ripped off me in the middle of the night. We recently found the outline of a small hand print on my bedroom roof, which doesn't fit the size of our hands. There has also been the ghost of a young girl seen in the corner of my room a few times.

We hear people walking along the hallway and unusual banging. Today our lounge door swung open and slammed into the couch behind it and there was nobody there. As we have 2 dogs, we checked to see if it could have been them and they were nowhere near the door at the time.

The TV and radio always turn on by themselves in my parents' room too. I always feel like we're being watched and its starting to get uncomfortable and as we live in an upstairs flat, every time I go up the stairs its like there's a second sound of footsteps behind me, I tried to put it down as an echo but it doesn't always happen.

We are all very religious and didn't want to put it down to a ghost when it first started off. But now its getting more frequent. There's just no explanation at all. It's usually me and my fiance that notice things happening. We would just like some advice on whether it's something to worry about or not. For example, whether it's a tormented spirit or a spirit meaning no harm like a family member or friend trying to show us that they are still around.