Religious conflict drove Llull to seek a rationally discoverable universal truth

Evidence

The sage, whose religious affiliation is deliberately not mentioned, speaks for all three: just as there is only one God, there can only be one true religion. If we could discover it rationally, using “necessary reasons,” war and strife could be eliminated and mankind would be united under the banner of true religion. — John V. Tolan, Saracens, 1312