I do not consider it an insult, but rather a compliment to be called an agnostic. I do not pretend to know where many ignorant men are sure - that is all that agnosticism means.
“Tell me what you feel in your room when the full moon is shining in upon you and your lamp is dying out, and I will tell you how old you are, and I shall know if you are happy.”
“If I can add, say, 10 great new violin concertos to the repertoire before I'm done, that will be truly exciting.”