If we have repented and believed on Jesus then He has promised that we can be in Heaven with Him. Rom. 10:9-11 says,
That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved. For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation. For the scripture saith, Whosoever believeth on him, shall not be ashamed.
But, as with His covenant with Israel, if we break our side of the covenant (in other words, if don't obey Him), then God is obligated by His holiness, justice, and righteousness to administer the consequences He laid down in the very beginning for sin: eternal death.
As far as we can see, this viewpoint comes straight from scripture but we would enjoy hearing your input.
Mikah and Morgan