Billy Graham's grand-daughter blasted white evangelicals this week, saying they are making God in their own 'ivory image'.

Jerushah Armfield is a longstanding critic of conservative white evangelicals including her own uncle, Billy Graham's eldest son Franklin, who will speak at his funeral on Friday.

Armfield accused evangelicals of losing 'any moral high ground or spiritual authority with a generation'. She said: 'You've lost the plot.'

Posting on Twitter on Monday she wrote: 'They see that all you're really interested in doing is making a God in your own ivory image and demanding that the world bow down to it.'

It comes after her grand-father Billy died aged 99 last week and the extended family, who cover a wide breadth of the evangelical spectrum, will gather in Charlotte for the funeral on Friday.

Since Billy's death a number of commentators have pointed out the differences between the great evangelist, who spawned the evangelical movement, and his son Franklin who is a polarising figure.

Armfield was spinning off an article written by John Pavlovitz titled 'White Evangelicals, This is Why People Are Through With You'.

'For eight years they watched you relentlessly demonize a black President; a man faithfully married for 26 years; a doting father and husband without a hint of moral scandal or the slightest whiff of infidelity,' he wrote.

'They watched you deny his personal faith convictions, argue his birthplace, and assail his character—all without cause or evidence. They saw you brandish Scriptures to malign him and use the laziest of racial stereotypes in criticizing him.

'And through it all, White Evangelicals—you never once suggested that God placed him where he was, you never publicly offered prayers for him and his family, you never welcomed him to your Christian Universities, you never gave him the benefit of the doubt in any instance, you never spoke of offering him forgiveness or mercy, your evangelists never publicly thanked God for his leadership, your pastors never took to the pulpit to offer solidarity with him, you never made any effort to affirm his humanity or show the love of Jesus to him in any quantifiable measure.'

He went on: 'And yet today, you openly give a "mulligan" to a white Republican man so riddled with depravity, so littered with extramarital affairs, so unapologetically vile, with such a vast resume of moral filth—that the mind boggles.

And the change in you is unmistakable. It has been an astonishing conversion to behold: a being born again.

With him, you suddenly find religion. With him, you're now willing to offer full absolution. With him, all is forgiven without repentance or admission. With him you're suddenly able to see some invisible, deeply buried heart. With him, sin has become unimportant, compassion no longer a requirement. With him, you see only Providence.

'And White Evangelicals, all those people who have had it with you—they see it all clearly.'