I have enjoyed searching out sacred piano duets for the intermediate level.  Here are a few I found online just since yesterday that you may want to check out.

1.Hymn Duets-One Piano-Four Hands-arranged by Sid Richardson (Alfred Music Publishing)

*Audio of sample page shown in the above link

2.Side by Side-arranged by Jeff Bennett (Lillenas Publishing) *Click on this title to hear and see samples and pdf downloads

3. Partners in Praise (Intermediate with Advanced Partner) arranged by Marilynn  Ham (Lillenas Publishing) *see samples and pdf downloads

4. Piano Duets for All Seasons arranged by Ethel Tench Rogers (Lillenas Publishing) *see samples and pdf downloads

5. Double Blessings arranged by Jolene Boyd (Lillenas Publishing) * see samples and pdf downloads

     *Audio of sample page shown in the above link

I found the first book on the above list at Amazon for only $4 total! I’ll share some audio samples from intermediate sacred piano duet books I own later tonight or tomorrow 🙂