After death you'll be dead, but you will reborn in (be part of) other life forms (insects, plants, ...)

At death, your flesh returns to the dust of the ground, whether through being buried, cremated, blown to bits, eaten by fish, or whatever...
Your spirit and soul, however, depart to one of two places. Heaven if you leave here with Jesus as your savior...and hell if you don't. Btw, having Jesus as your savior really doesn't have anything to do with how "religious" you are...but whether or not you've accepted the sacrifice he made in your behalf when he died for your sins... :0)

Your body is buried or cremated ect. and some part of you lives on. You can be sort of reborn or reincarnated into a new body with no memory of a past life or you can go to an afterlife. Don't trust religious views on the afterlife. It most likely exists but the specifics cannot be known as none have ever made it completely there and back. Make up your own view of what the afterlife may be, but don't let some guys in robes tell you where you can or can't go. "Sin" is a human feature. Any afterlife is open for all no matter how good or bad you have been, including reincarnation.