Solution to Something Looks Fishy

Here's the first sentence:
BWRURNWVCU CBCXYCYWRNI LCDBWLM UEY OTS VRQCYTSQ VUSQ NWDGWAWYWI WWYLRTY MCDWEQIYWDN XQSWOBRDYCU DWIQCIQ.

This is a cipher where every word has one letter that's plaintext. Decrypt:
BIOLOGICAL ADAPTATIONS HANDILY LET OUR CREATURE CURE GINGIVITIS WITHOUT MANIFESTING PERIODONTAL DISEASE.

Plaintext letters:
BNLEORUGWMOD

Also, this poem clues:
BRISTLEMOUTH

The plaintext letters from every decryption create a shared cipher (where every answer has one letter that's plaintext). In this case it's a B.

These overlapping letters spell the answer, BAPTISTRY.

Here are the sentences and their decryptions:

TN PXBQKGBUAYLHLW CPQQBNF DBDTFBQ KGO FQYVAPGI DVQYLH LBAQUW BXBRW TQHUABLF.
AN OVERWHELMINGLY CORRECT DEBATER WHO TRIUMPHS DURING NEARLY EVERY ARGUMENT.

MYSGTJYZ ISQKZ, JHSM OBGRQ HLEED IUGYYED DERYYZ DEGMQ'J MKGNI LEQP MRZSQG PDRZGDM.
SLIGHTLY DINKY, THIS OCEAN FLOOR DWELLER REALLY DOESN'T SPEND LONG SAYING PRAYERS.

ELRQFT KMTLWUMT WJLT ROZ MQOJW YIFH UFHTM VFIVFP, WLCFZWP, LNH KMLKKTH ATAATR.
MARINE CREATURE THAT YOU MIGHT FIND UNDER ONIONS, WALNUTS, AND CRACKED PEPPER.

NQGUR LNTL VQTGWQMT, RUIL GMIDGW WQWW LUNNFILUWJ ANIODN WUGR MNGHBJ GMQMGWL GHE.
EIGHT LEGS WIGGLING, THIS ANIMAL WILL SHEEPISHLY BECOME WHAT NEARBY ANIMALS ARE.

HCTURTNKPO RVWTPSNDT, KEIY FRVGO SRRYKISTIV WIVXTCY ACNRVX JPISKQVW PORX DUYQSIP YKOPQNWY.
FREQUENTLY UNWELCOME, THIS FUNKY CRUSTACEAN WANDERS AROUND BLASTING LOUD MUSICAL STYLINGS.

OHCNFXW FXVCPXHL FXK, VHFE LCSCKJTS PEWGRHPRT UCRFVCPE CZVPCMCRT LJXW RCVTCPE.
PACKING INTERNAL INK, THIS BEHEMOTH REGULARLY DELIVERS EXTREMELY LONG LETTERS.

YUDESDQLH LOULDQV KCSDZVBP DCINP WQSSCI YRUZJHP IQJEE USJCIDUA.
POTENTIAL AQUATIC KENTUCKY DERBY WINNER PROUDLY RIDES UNDERTOW.

REXUNFO, SGSUOBTNO LTGSP EHXP VTBSY DUSKTJUS WYT JMCTMNXEXTMKFFO YTJ'FF DKLF "CEPE WUXSMD."
WEIRDLY, EVERYBODY LOVES THIS POKEY CREATURE WHO UNCONDITIONALLY YOU'LL CALL "BEST FRIEND."

And here are the plaintext letters, answers to the clues, and overlapping letters: