Which is what in your opinion?
C'mon, RR! You are an intelligent girl! You have an inquiring mind. I know you know the answer in your heart, you just have to listen to your inner self.
WHAT IS HEAVEN? Heaven is the Abode of God. It is nowhere you can get to though by rocket nor plane. God neither created it nor it created God, instead, it is part of God. It is God's eternal abode regardless of what he does or where he appears in the phenomenal universe, heaven is where God eternally resides in his true form. But Heaven is an attainment not a guarantee! Heaven is like finally saving up for a weekend stay at the Waldorf Astoria--- your booking guarantees you passage to go there, not a guarantee that you can STAY there irregardless of your acts! Damage the room and you will be thrown out! So attaining heaven is not relief from your personal responsibility.
Every living soul is a plenary portion of God who originated in Heaven but fell from grace through personal sin. This usually comes in the form of ego identification seeing oneself as separate from God and master of your own domain when indeed we are all servants to God. This leads to forgetfulness of God, separation and a falling from his Grace. This is not a punishment, rather, God's freedom of giving us both free choice and karma for our actions.
Therefore, rather than think of Heaven as a place where there is no sin, think of it as a place one may attain once one attains a purity of state and remains free of sin.
WHO WAS LUCIFER? Lucifer was an angel. But rather than choosing to remain with God, he dared see himself as equal, so fell from grace. So, Heaven does not prevent sin but rather insists on freedom from sin.
And who can really say? Could Lucifer repent and rejoin God in heaven? I think so. But I personally suspect that this is all part of God's design, for you see, Good cannot exist without Evil just as there can be no UP without a DOWN. What would heaven be without its polar opposite? Without Hell, Good would have no meaning if that is all there was. How can there be a good without a bad? So, perhaps Lucifer is by choice and design eternally condemned to Hell and damnation so that we can have free choice. That way, we all have a choice on where we go, depending on our deeds and actions. Before us is an infinity of choices depending on our actions and advancement in life, from eventually attaining an abode of infinite Love, to a place of utter suffering and misery.
Like Lucifer, each of us is free to choose.