You can't accuse the SPLC of having any particular ideology beyond the almighty dollar. If every conservative in the land sent the SPLC a ten-dollar bill there would be no end of breathless "Left-wing" plots and alarums from the nation's most profitable "non-profit."
As it is, the majority of the SPLC's donors are not conservative and many do not hold Christian ideals, which is why the SPLC can make comments like this on its "Hate Map" fundraising tool:
"...[N]eo-Confederacy claims to pursue Christianity and heritage and other supposedly fundamental values that modern Americans are seen to have abandoned."
Yeah. Christianity and other fundamental values that modern Americans have abandoned.