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Here is the record of his baptism in the Evangelical Reformed Church in Frederick, MD: "Johannes, son of Philip and Dorothea Christ, b. 30 Oct. 1778, bp. 4 Apr. 1779. Sponsors: Johannes and Christina Huber." [William J. Hinke and Frederick S. Weiser, Maryland German Church Records, Vol. 5, p. 44] I think that clears up any confusion about who his parents were.
The problem comes in determining who Dorothea was before her marriage to Philip Crist. There was a Philip Crist who came to Baltimore prior to 1758, age 15, with his father Jacob Crist. This may be the same man, but you would need to do more research in the records in Maryland. They aren't online. I would check the records from the Evangelical Lutheran Church from about 1760-1767.
Philip and Dorothea had these children baptised in the same church:
Johannes b 09 Mar 1767 bp 26 Apr 1767 [died before 1778 and they reused the name, a common happening back then]
Maria Elisabetha b 31 Mar 1768 bp 19 Jun 1768
Johann Philip b 26 Jun 1770 bp 22 Jun 1770 [note switched dates in transcription from the parish book]
Anna Catharina b 14 Jan 1772 bp 22 Mar 1772
Valentin b 14 Nov 1773 bp 17 Apr 1774
Maria Catharina b 16 Aug 1776 bp 13 Oct 1776
Johannes b 30 Oct 1778 bp 04 Apr 1779
Anna Maria b 22 Jul 1781 bp 14 Apr 1782
Anna Barbara b 01 May 1784 bp 08 Aug 1784
Jacob b 11 Dec 1787 bp 25 May 1788
There was a naturalization of a Philip Crist in Frederick Co., MD in 1765, but the record itself is not online.
There was a Philip Crist who was serving in Col. XXXXX XXXXX's Batallion in Frederick Co., MD in 1779.
If it is the same man, there is a will of a Philip Crist in Frederick Co., MD dated 1812. It is not online.
I am sorry there aren't more records online and that research will need to be done in person in Maryland. I did not find an Adam Crist in Maryland in that time frame.
Hope this helps a little