Goddess of all sins and elements

Starts off as Two sisters who go from running through fields finding out they are the goddesses of all the 7 deadly sins and all 4 elements of the world, which are Earth, Fire, Water, Air. They are the fist goddess of the world, along with the Greek Gods. But this book is about the 2 daughters of the Greek Gods. These girls are the most powerful beings of all and they are about to go on a journey that could possibly be there downfall. They have all the powers of the world.