The surname Kirkpatrick in Ireland is interchangeable with Kilpatrick, and there more Kilpatricks than Kirkpatricks. (The 1901 census of the county has 49 Kirkpatricks and 75 Kilpatricks). So search under both versions of the surname as they were used interchangeably in Ireland. (Robertson/Robinson is the same, and there are other examples).
There is a townland of Ballindrait, in Clonleigh parish. That sounds a bit like “Bellenthralt” (which definitely isn’t right.).
You may struggle to find any record of Henry. Records for Co. Donegal pre 1850 are thin on the ground.
You can use Griffiths Valuation to see which parishes the surname was found in, in Donegal in the 1850s, and you could then focus your research on churches in those parishes looking for his baptism. You haven’t said what denomination he was, but if Church of Ireland or Presbyterian, then the records may not be on-line. There are copies of most of the surviving ones for those denominations in Donegal in PRONI (the public record office) in Belfast but a personal visit is required to view them.
Possibly DNA testing may be a way of matching with others who have additional information about where the family originate. Family Tree DNA reportedly has more people with Ulster roots than any other company. That obviously increases the chances of finding a match. You might want to try them or, if you have already tested, you can transfer your results to them for no fee.
The North of Ireland Family History Society are running an Ulster DNA project and can offer FTDNA testing kits at a reduced price. http://www.nifhs.org (Go to DNA project on the website).