It is embarrassing to recall that I didn’t think my grandparents were Christians. They were Catholics, you see, and so I believed that they worshipped the chipped statue of Mary that stood atop their China hutch. I must even have thought that they intended to hoist themselves into heaven with the rosaries that hung on their bedroom mirror. As an earnest young Evangelical Protestant, I set my faith against theirs.

I only realised how stark this opposition must have been in my mind when I stumbled last week across the testimony that I read out when I was baptised at age 13. Here is what I told the people who assembled on the river bank to see my immersion: