SOLVED. A book about an evil cabin, satanic ritual, and two boys. [s]

[Gilith]

What reading level it is aimed at: Adult
What the genre is: Fantastic
What format: Dead tree
What date: i read it between 2000-2010 But it might be an older book because my parents have like 10000+ books and i ain't even making things up we have a garage full of books and every room in the house have at least 2 shelf full of books.

Hello!
So the story start, by the two boy who are cousin goin to their grandmother house with their parents wich is an inland island so theirs a description of the bridge.

One of the boy is a child with no problem living a pretty normal life, the other has serious familly issue his father hate him because he's too weak he can't even catch a baseball ball.

While exploring the island they found a cabin except it's an evil cabin with an evil book insid then the normal boy will find a strange girl at an attraction park. And then they do some satanic ritual in the cabin and strange things happen wich i don't remember.

Spoiler:
At the end the weak boy kill all the familly with killer frogs by changing the reality inside the island... or something like that.
I've been searching this book for years but i'm not a big reader so except Stephen King i don't know many fantastic authors.

[Gilith]

I got the name it's Neverland by Douglas Clegg. I'm so happy!