is the title and first line of perhaps my favourite picture book.  It is by Janet and Allan Ahlberg.
The alliteration makes it fun.
Playing a hangman game with friends once, they suggested that P was my favourite letter.  Probably true.  This post has a preponderance of Ps.
Peter Piper picked a peck of pickled pepper is the opening of a tongue-twister.
Pen-pushers are provided with plenty of technical terms beginning with P.  The majority of tenses do: present, past, perfect, pluperfect.  A past participle is needed for the latter pair.
Pronouns and proper nouns, parts of speech and polysyllabic words provide further examples.  A sentence has a subject and predicate.  At primary school I practised picking them out, but I was never taught how to parse as per my parents’ generation.
Wordplay includes puns, palindromes, puzzles and punch lines.
Phrases and pseudonyms need the letter P, but avoid the explosive, popping sound it makes.
Are you puzzled and perplexed?  I am going to proofread, polish and publish this post.  Then I hope you, my public, will peruse it or pore over it.
There are many possibilities for people of faith to use words beginning with P.
We can pray, praise, make pleas or petitions, sing psalms and possibly prophesy.  We can read the pronouncements of the prophets and know the peace which passes all understanding.

There are plenty of scripture passages using repeated Ps.

In the King James Version of Deuteronomy Chapter 14 verse 2 For thou art an holy people unto  the Lord thy God, and the Lord hath chosen thee to be a peculiar people unto himself…   The link goes to a modern translation.