Ummm... Scott Morrison has actually been Prime Minister of Australia since last year. It's the first time he's won a general election, but he's not new to the role.
It's also highly unlikely that his religion had anything much to do with him winning the election, as far as most voters are concerned. Religion doesn't play a significant role in Australian public life in general, let alone in politics. We (I'm Australian) have a strict separation of church and state, and the vast majority of us — including those who are practising Christians — wouldn't want it any other way. I definitely wouldn't.
Also, the way our voting system works, we're ultimately voting parties, not people, into power. We don't have a directly elected head of state. Scott Morrison is simply the leader of the party that most people voted for. If he loses the support of his political colleagues, he can be dropped from leadership and another top party member would then become Prime Minister (without any public election) — which has happened several times in the last couple of decades in Australian politics. That's how Morrison became PM in the first place, actually.
What I'm saying is, the fact that Morrison's party has been re-elected doesn't mean the majority of Australian people have suddenly become fans of "Biblical Christianity" (whatever that is). Knowing Australia and Australians, I can assure you that's
extremely unlikely. It just means he and his party are more popular — or less unpopular — than the current opposition. That's all. And I really wouldn't go so far as to suggest it was by special intervention of God.