Spacing Between Paragraphs

I have to edit each page and erase all <div> and in between each paragraph insert <div> </div> to make it work.

It depends on which pages you want it to apply and how big should be the gap between these paragraphs.

The basic idea would be to sell margin between paragraphs globally on all posts. It can be done by adding this code to Theme Options – Other – Custom CSS

.entry-content p {
    margin-bottom: 30px;
}

You can feel free to modify margin to get the results you were looking for. If you need some more specific solution that applies for only that particular page then let me know and I will write CSS for that.