Student or Learner
When a person's faith in his religion becomes less strong, what word should I use to describe this.
He has backslided.
His faith in his religion has waned.
Can the above words in bold be used?
His faith isn't as strong as it used to be.
His faith is diminishing.
His faith has waned a little/a lot.
He's not as radical/fundamental as he was [about religion].
He's started to come to his senses.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.
Thanks, Bhaisahab, for pointing out the error.
It should be 'backslid'.
The word 'lapsed' often collocates with religions; 'lapsed Catholic' seems to me very common
(Not a Teacher)
All of the posters above have made excellent suggestions. I personally prefer the sentence you proposed in your original post: "His faith has waned" (minus the 'in his religion' part)
If you're interested, the specific word for this is 'apostasy' (with 'apostate' being both the noun and the adjective). However, it's a rather scholarly word, so it will sound a bit highbrowed in everyday conversation.