With all due respect, Susan, with regard to African American spirituals, there are a number of religous songs being written in the formats of {pre-emancipation African American} spirituals. However, these types of religious songs composed after the end of the 19th century, are usually categorized as gospels and not spirituals.

If the definition for folk songs is songs which have no known composers, and also songs whose words have been re-worked as a result of the folk process, newly African American religious songs which "sound like spirituals" would not fit that definition and thus would also not be considered folk songs.

Here are two video examples of newly created songs which I think "sound like spirituals" but are categorized [by their composers and other African Americans and other folk] as gospel songs:

http://www.youtube.com/watch?v=4QyVPKbZzww
Byron Cage - "The Presence of The Lord Is Here"

and http://www.youtube.com/watch?v=on4nFUY8GEk&NR
Edwin Hawkin Singers-"Oh Happy Day"

And here is the lyrics of another song that seems to be written in as a spiritual:

SPIRIT OF DAVID {When The Spirit Of The Lord}
{Fred Hammond}

When the Spirit of the Lord comes upon my heart
I will dance like David danced
When the Spirit of the Lord comes upon my heart
I will dance like David danced

I will dance, dance, dance like David danced
I will dance, dance, dance like David danced

When the Spirit of the Lord comes upon my heart
I will pray like David prayed
When the Spirit of the Lord comes upon my heart
I will pray like David prayed

I will pray, pray, pray like David prayed
I will pray, pray, pray like David prayed

When the Spirit of the Lord comes upon my heart
[ Lyrics provided by www.mp3lyrics.org ]
I will sing like David sang
When the Spirit of the Lord comes upon my heart
I will sing like David sang

I will sing, I will sing, sing like David sang
I will sing, I will sing, sing like David sang
I will pray, I will pray, pray like David prayed
I will pray, I will pray, pray like David prayed
I will dance, I will dance, dance like David danced
I will dance, I will dance, dance like David danced

I will dance, I will dance, dance, dance
(Repeat)

-snip-

Here is that song as sung by the original group who recorded it but used as background to a youth group's dance group's video:

http://www.youtube.com/watch?v=SZuKZyr54Eg&mode=related&search=

For contrast, here is the same song as it was sung during a Black church service:

When the Spirit of the Lord (Dance like David Danced)
http://www.youtube.com/watch?v=pQtYsaLpE4w&mode=related&search=

Note: that in the end of this video clip, the church slowed down the song's tempo and then eventually speeded it back up again and then slowed it down again a couple of times {changing tempos within a song is a custom that is used with many African American songs}.

These songs have known writers/composers, fixed words, fixed order of verses, and relatively fixed tune, and a relatively fixed tempo. This doesn't mean that no one is changing the order of verses or adding additional ones, or changing the tempo. However, fwiw, I wouldn't call these songs either spirituals or folk songs. I'd call them what their composers/writers calls them- contemporary gospel songs.