What Loftus is describing is the cornerstone of science:
skepticism . Based on how you presented Loftus' position (I have not read his work), I see nothing unique outside of good scientific inquiry. Loftus' proposal appears to be about determining the truth value of a claim, whereas your friend appears to conflating this with what is called
satisficing , or finding a "good enough" solution.
Do I need to test every religion, or can I stop when I find the one that ‘fits’?
Regardless of being true, if it "fits," it simply means it works for that person. We don't date every single person in the world before we choose a spouse—we discontinue our search when we find one that "fits." Of course, the irrational will claim that they found their
one and only "soulmate" (who just happened to be in their same high-school out of a world of 7 billion people). In Cinderella terms, fairy tales and foot deformities aside, there are many feet that will fit a shoe.
The central problem with religious belief that is being described here is found in
motivated reasoning . When one is highly motivated toward a conclusion, the reasoning process is severely hampered by the person's inability to evaluate the strength of evidence. To a die-hard theist, a sunset is strong evidence for God. Christianity (most forms) creates this motivation through eternal paradise or eternal torture. A scientist, or anyone really interested in the truth, needs to be indifferent to the conclusion. With this indifference comes clarity and the ability to evaluate evidence in proportion to claims. We might be able to sum this up in the quote by Sagan who says, "extraordinary claims require extraordinary evidence," where those who engage in motivating reasoning go by the rule "as long as the extraordinary claim supports my conclusion, any level of evidence will do."