After a fair bit of reading including Quranic versus (and correct me if I am wrong) Christians or People of the Book do have every opportunity to enter Heaven as do Muslims however I am a little confused by the prayer part.
Assuming Prayer as we know it today is a requirement of Islam, it wasn't a requirement in its 'current practise method' during Christianity times (again correct me if I am wrong as I have no true confirmed access to the - original - bible).
Since that is the case, how would a Christian enter heaven? I know that belief in one God, belief that God does not have a child, doing righteous deeds gives Christians this chance of entry but is that enough to exempt them from the current Islamic prayer?
For that matter, if it doesn't exempt them and prayer is required, then ultimately haven't they already passively converted? At which part of belief do they even remain Christians?