I have a couple of questions about "religious" stuff.
1) I heard somewhere that Satan isn't really the king of hell but he's the king of the earth
What this means is that the Earth isn't a perfect utopia. There is bad in the world and it will never be perfect. As such, we can say that evil rules this world and goodness only operates within it to give us things like grace, forgiveness, deliverance, revelation, etc.
2) what is the difference between the god of Christianity, Mormons, and Catholics.
There is one true God with different names according to different languages. When people talk about Islam as worshipping 'Allah' as if that's something different from 'God,' that is a perversion of truth. It would be like saying the word, "perro" in Spanish refers to something else besides a dog.
3) is it possible to go into debt with satan
Karma is a good conceptual bridge between financial debt/credit and spiritual debt/credit. In the Bible, it says that the wages of sin are death. This is logical as sin begets further sin and killing/death is the ultimate deviation from healthy living.
Forgiveness is central in Christianity, and it is very similar to the financial concept of debt-forgiveness. In finance, you also get 'grace periods' where you don't have to pay for a while. In Catholic philosophy, purgatory is a temporary state of hell where you pay off debts of sin after dying. You don't really pay off all your debts, because forgiveness actually eliminates them, but you have to become sanctified, i.e. cleansed of sin, before you can live in heaven.
4) is the Ouija board actually a way to contact evil spirits or is it just a fake
5) can evil spirits actually get summoned using a pentagram
Spirits are really just psychological dispositions. You can generate negative psychological dispositions using these kinds of methods. You can stir up negative emotions, hate, and malice in other ways as well, if you choose. If you cultivate/summon these evil spirits in your life, it will invite contact with more evil outside of yourself as well. You have to choose what direction you want to go in and pray for God's forgiveness because there is so much sin and we are only aware of some of it.