yep. However, OP asked for a substitute of "thy kingdom come", so both of our answers are not usable :-/

Kann sein. Ich meinte "Gott ist groß." Gruß Karl

Thanks for your response, karlgoethebier, 'allah akbar' has 4 syllables and seems to fit in. I provide an example of output I like.

Output:

(silence),
who art in heaven,
Hallowed be your name.
allah akbar,
Your will be done,
On earth as it is in heaven.
Give us this day our daily bread;
And forgive us our trespasses,
As we also have forgiven our trespasses;
And lead us not into temptation,
But deliver us from being too serious.
For thine is the big blue boat and the power and the glory, for ever. 
+Amen.

(silence) grant me the serenity  
To accept the things I cannot change,  
Courage to change the things I can,  
And wisdom to know the difference.
[download]

#!/usr/bin/perl -w
use 5.011;
use Path::Tiny;
use utf8;
use open OUT => ':utf8';
use Data::Dump;
use Text::Template;
use POSIX qw(strftime);
binmode STDOUT, 'utf8';

my $input = <<'(END INPUT)';
{$God},
who art in heaven,
Hallowed be {$thy} name.
{$Thy_kingdom_come},
{$Thy} will be done,
On earth as it is in heaven.
Give us this day our daily bread;
And forgive us our trespasses,
As we also have forgiven our trespasses;
And lead us not into temptation,
But deliver us from {$evil}.
For thine is the {$kingdom} and the power and the glory, for ever. Ame
+n.
(END INPUT)

my $input2 = <<'(END INPUT2)';
{$God} grant me the serenity  
To accept the things I cannot change,  
Courage to change the things I can,  
And wisdom to know the difference.  
(END INPUT2)

my $path1 = Path::Tiny->cwd;
say "path1 is $path1";
say "input is $input";

## populate hash
my $data = [
  [ 'God', '(silence)', '&#1041;&#1086;&#1088;&#1080;&#1089;&#1073;&#1
+086;&#1078;', 'Elohim', 'Group Of Drunks' ],
  [
    'Thy_kingdom_come', 'Armageddon can wait', 'allah akbar', 'Let sci
+ence be'
  ],
  [ 'evil', 'ego', 'your followers', 'being too serious' ],
 [ 'Thy',  'Your' ],
 [ 'thy', 'your' ],

  [ 'kingdom', '&#1062;&#1072;&#1088;&#1089;&#1090;&#1074;&#1086;', 'r
+ealm', 'big blue boat' ]
];

#dd $data;

## main loop
# set trials
my $trials       = 15;
my $dummy        = 1;
my $first_second = strftime( "%d-%m-%Y-%H-%M-%S", localtime );

while ( $trials > 0 ) {

  # create an output file

  my $out_file =
    $path1->child( 'my_data', "$first_second", "$first_second\.$dummy.
+txt" )
    ->touchpath;
  say "out_file is $out_file";

  my %vars = map { $_->[0], $_->[ rand( $#{$_} ) + 1 ] } @{$data};
  my $rvars = \%vars;

  my $template = Text::Template->new(
    TYPE     => 'STRING',
    ENCODING => 'UTF-8',
    SOURCE   => $input
  ) or die "Couldn't construct template: $!";

  my $result = $template->fill_in( HASH => $rvars );
  $out_file->append_utf8($result);
  $out_file->append_utf8("\n");

  my $template2 = Text::Template->new(
    TYPE     => 'STRING',
    ENCODING => 'UTF-8',
    SOURCE   => $input2
  ) or die "Couldn't construct template: $!";

  my $result2 = $template2->fill_in( HASH => $rvars );
  $out_file->append_utf8($result2);

  $trials -= 1;
  $dummy += 1;

}    # end while condition

print "OUTFILES*******************\n";
foreach my $filename ( glob("./my_data/$first_second/*") ) {
  open my $fh, '<', $filename or die "can't print $filename! $!";
  while ( my $line = <$fh> ) {

    print "$line";
  }
  say "-------------";
  close $fh;
}

__END__
[download]

I've field tested 'allah akbar' as a substitute for 4-syllabled things, and I quite like it. It has a lot of breath, which in many languages is a synonym for "spirit."

Thanks all for comments. I wanted to discuss further, but it may have been more about comparative religion and less about perl, so maybe best not.