Prove it -- with 21st century forensic testing.
The RCC claims to have done tests on a miracle Eucharist in 1971. That was all before DNA and other amazing forensic tests that are proven reliable every day -- in law, medicine, etc.
Spiritual superior? Prove it.
God knows there is no other evidence, except what the RCC produced itself. Real-world, real-life evidence says your claim is absurd at best.
STOP BEING A LAUGHING STOCK. Prove it.
Would catholics call a scientist a liar if a consecrated host was lab tested and its contents were declared to be nothing but baked unleaven bread only? Probably.