This is either an extremely obvious and boring observation or the basis for a metaphysical trip, depending on how pre-disposed you are to "mathematical spiritualism" :)
Nothing can be objectively interesting, only objectively true. Just because math is objectively true does not mean you've been robbed of your license to decide if you think it's interesting. :)
Agreed. Similarly, just because I don't "get" church doesn't mean I can prove God doesn't exist. And it certainly doesn't mean I should stand in the way of others enjoying the experience of going to church regardless of their beliefs. It just means I don't "get" it.
Religion is slightly different though, they claim actual direct truth (not mere truth of implication given certain assumptions) which makes their claims more interesting but prevents them from claiming automatic objective truth. The Formal Gospel would go, "If God so loved the world that he gave his only begotten son, ..." ;)