I believe that Samuel Hatch was not married to Mary Bryant Churchill and that profiles that show Samuel Hatch and Mary Bryant Churchill as parents should be corrected to show Samuel Hatch and Mary Doty Hatch as their parents.
Mary Bryant Churchill's dates of birth and death are similar to those for Mary Doty Hatch 1654-1715.
None of the published genealogies that I could locate show that Mary Bryant Churchill ever married Samuel Hatch. For example, see:
New England Marriages Prior to 1700 by Clarence Almon Torrey, Elizabeth Petty Bentley (Genealogical Publishing Co. Baltimore 1985)
Boutelle, John A., Stephen Bryant and His Descendants , (NEHGR, Vol 24 pages 315-325 (Oct 1870)
http://trees.wmgs.org/getperson.php?personID=I11086&tree=Schirado
http://www.werelate.org/wiki/Person:Mary_Bryant_(14)
http://www.maineancestry.com/family%20tree/FTMOUT/d0004/g0000029.html
http://familytreemaker.genealogy.com/users/s/p/o/Russell-E-Spooner/...
http://www.whosyerdad-e.com/families-m/family.php?famid=F14166&...
http://awt.ancestrylibrary.com/cgi-bin/igm.cgi?op=GET&db=flakey...
The genealogies for Mary Bryant Churchill almost always show that she married Eleazer Churchill and had four children, Abigail, Eleazer, Jedidah and Mary between 1680 and 1689.
http://freepages.genealogy.rootsweb.ancestry.com/~dantrogers/pafg36...
http://aleph0.clarku.edu/~djoyce/gen/report/rr06/rr06_491.htm#P2158
http://www.gibnet.us/ancestry/pafg37.htm#945
http://capecodhistory.us/genealogy/wellfleet/i1293.htm
http://ralphinla.rootsweb.ancestry.com/hatchj.htm#i1098
http://familytreemaker.genealogy.com/users/e/n/f/Jerry-A-Enfield-Ri...
The Scituate, Massachusetts birth records can be found at http://aleph0.clarku.edu/~djoyce/gen/scituate/partI2.html
They all show Samuel Hatch as the father, but none of them lists a mother. The dates, 1678-1695 would be entirely inconsistent with Mary Bryant Churchill's reasonably well documented marriage to Eleazer Churchill.
While I think the evidence is strong for removing the relationship between Samuel Hatch and Mary Bryant Churchill, I do note two sources, which I believe do not support the proposition that Mary Bryant Churchill was the same person as Mary Doty Hatch:
http://speot.com/pafg212.htm reports that Eliezer Churchill married Mary Bryant in 1676, and then married Mary Doty 8 February 1685, and cites ""U.S. and International Marriage Records, 1560-1900- ancestry.com The Churchill Family in America, compiled by Gardner Asaph Churchilland Nathaniel Wiley Churchill." It claims further that Elizer Churchill and Mary Doty Churchill had four children from 1691-1698, dates which are completely inconsistent with the dates and longstanding Doty genealogies for Mary Doty Hatch, as I noted above. In any event, that web page does not claim any marriage between Mary Bryant and Samuel Hatch.
http://www.cyberancestors.com/cummins/ps83/ps83_367.htm has an interesting note that is not attributed to a source:
"ELIEZUR, Plymouth, s. of John of the same, m. 8 Feb. 1688, Mary Dotey, wid. I presume, of some gr.s. of the first Edward, and had four or five ch. but by a former w. also Mary, had Hannah, b. 23 Aug. 1676; Joanna, 25 Nov. 1678; and sev. of the foll. tho. as date of only one is kn. to me, I must not disting. which mo. bore ea. Abigail; Eleazer; Stephen, Feb. 1685; Jedediah; Mary; Elkanah; Nathaniel; Josiah; and Jonathan. His w. d. 11 Dec. 1715; and he d. 5 Mar. foll." Again, this unsourced note is not consistent with the Scituate birth records for the children of Samuel Hatch.
Therefore, I recommend that the profiles that show Samuel Hatch and Mary Bryant Churchill as parents should be corrected to show Samuel Hatch and Mary Doty Hatch as their parents. This would be consistent with the long-published Doty family genealogies.
Do others agree? Are there any sources to support a marriage between Samuel Hatch and Mary Bryant Churchill?