Are the saints in heaven more or less alive than we are?
Are the saints in heaven members of the Body of Christ?
Is the Body of Christ divided?
...and if they pray to dead people isn’t it because they believe dead people have the same or similar powers as Jesus Christ?
No.
There is confusion regarding the Catholic practice of "praying to the saints" because Catholics and non-Catholics use the term "pray" differently, at least in the English speaking world.
Catholics use the word in its archaic form, meaning "to ask." We simply ask the glorified saints in heaven to pray to God for us, just as we would ask saints on earth to pray for us. We are all members of the One Body of Christ.
The term "pray," in modern usage, connotes worship; hence the confusion.
The Bible is very clear that the dead are dead. Why do you think they’re in heaven? Many times throughout the Bible, it talks about David, Abraham, Isaac, etc., still being in the grave. If they’re still in the grave why would others be in heaven? Why would anyone be in Heaven if the day of judgement has not yet come?