Couples "whose religious differences become difficult to work out on their own and feel triangulated by faith communities on a wider level, it can have a very damaging impact on their relationships and their children.
"Isolation and mistrust can lead to relationship breakdowns and distrust in the other.
The Al-Yousuf's decided to bring up their children in both religions.
"That was quite an important psychological moment for me to get through, that negative association with all things Islamic." The family did recite the Sura, and Mrs Al-Yousuf also sang the Lord's My Shepherd.
"I suppose, when the chips are down, that's the religious experience that you want to hand on to your children, regardless of what else," says Mrs Al-Yousuf.
When Heather Al-Yousuf, first met her husband of 28 years, they both felt a strong connection to their own faiths.
But their love was not straightforward as Heather is Anglican and her husband is Shia Muslim.
"Very often, the couples I know, have been together for a very long time before they make that [marriage] actual choice.
It is not my place, to tell a Muslim woman, no you can not marry, obviously she knows in her heart as a Muslim woman it is forbidden in Islam for her to marry a Christian man...
"The whole notion of marriage is a little up in the air at the moment, we have all kinds of parallel systems of living, in a way those that choose to marry are those really old-fashioned traditional ones in either society and for us to be kind of tough on some of those who are choosing to marry, is counter-culture in a way." Mrs Al-Yousuf fears if support is not provided the impact on the children could be particularly detrimental.
"It's pretty toxic when it doesn't work," she says.
The Christian Muslim Forum, an organisation that promotes a better understanding between Muslims and Christians, has also recently produced ethical guidelines to help faith leaders give pastoral support.