Christians: Why do you claim God won't prove He exists while also claiming He performs miracles?

There's no reason, in theory, why god's presence couldn't be measured or detected in some way. The only reason that believers claim that god "can't" be detected in this way is because god *isn't* detected, and so a vast and intricate rationale has to be devised to explain this vast, loving, eternal, all-powerful "something" which is, in every external, objective respect, indistinguishable from nothing.