God is a supernatural God by definition - He made the world and us. He raised people from the dead. You get the idea - His powers are greater than those we are used to. Heaven is supernatural, it does not work solely by natural earthly principles.
Think how chaotic it would be if anyone could exercise supernatural powers here, for good or evil.
I believe the spirit enters the body at the moment of conception. The Bible says God knew us from before the world was made, so He made our spirits a very long time ago.
If you want to know more, look up some of these names on the Web and on YouTube -
James Maloney
Ian Andrews
Andrew Wommack
John Bevere
Steven Furtick
Bill Johnson at iBethel Church
Joseph Prince
Joyce Meyer
Visit some independent charismatic churches. You'll find them welcoming. It's hard to understand Christianity with its proper supernatural component without meeting people who believe and live it. They won't make you feel uncomfortable.