The claim that a 'third transgender and known liberal attacked a Christian school' is misleading because while there have been multiple shootings at Christian schools involving perpetrators identified as transgender, the sources do not confirm the number 'third' nor the political affiliation 'known liberal,' and the details vary by incident.
A third transgender and known liberal attacked a Christian School.

MAGA Responds After Annunciation School Shooter Identified as Transgender - Newsweek
Source: newsweek.com
Key Evidence
The Nashville shooter was confirmed transgender by police and killed six at a Christian school.
news.sky.comnews.sky.comNashville school shooting: Transgender killer who murdered three kids was...
pbs.orgpbs.orgWhat we know about the Nashville Christian school shooting that left 6 dead
The Madison shooter’s transgender status was not confirmed by officials despite social media claims.
politifact.compolitifact.comAfter a student killed two people and injured six others at a private Christian...
The Minneapolis shooter’s gender identity is not confirmed as transgender in available reports.
latimes.comlatimes.comA shooter at a Minneapolis Catholic school kills 2 children, injures 17 others
What the Evidence Shows
There are at least two well-documented incidents involving shooters who identified as transgender attacking Christian schools: the Nashville Covenant School shooting in 2023 and the recent Minneapolis Annunciation Catholic School shooting in 2025.news.sky.comnews.sky.comNashville school shooting: Transgender killer who murdered three kids was... 2) The Nashville shooter, Audrey Hale, was confirmed by police to be transgender and was responsible for killing six people at a private Christian school. This incident received extensive media coverage and analysis regarding the shooter's gender identity. 3) The Minneapolis shooting involved Robin Westman, who attacked a Catholic school; however, sources do not confirm Westman's transgender status. 4) The Madison, Wisconsin shooting involved a student who killed two people at a Christian school, but officials did not confirm any transgender identity for the suspect despite social media claims.
politifact.compolitifact.comAfter a student killed two people and injured six others at a private Christian...+3 more 5) None of the sources provide evidence that these shooters were politically identified as 'known liberals.' Political affiliation is not mentioned or confirmed in any credible source.
The phrase 'a third transgender' implies there have been exactly three such incidents; however, only two confirmed cases with transgender shooters at Christian schools are documented in these sources. The Madison case is unconfirmed for transgender identity.
Therefore, the claim mixes some factual elements (transgender shooters at Christian schools) with unverified or false elements (exact count of three, political affiliation). This makes the statement misleading rather than fully true or false.