God has no permanent friend and He does not have a permanent enemy. You will be the one to decide who you want to be to God. A sinner who is an enemy today may repent and become saved and become God’s friend. A Saint today if he falls into sin and refuses to repent will turn into God’s enemy (Read Ezekiel 18).
That’s why there is no security for any saint until we lay down our sword at the master’s feet. Don’t follow those who preach eternal security, such men will lead you to eternal perdition.