Many believers scan the sky every night to serach for the answer.
SETI is a program designed to aid in this search for extraterrestrial intelligence by scaning the skies using the Arecibo telescope in Puerto Rico and then analyzing the data obtained on computer. None of the computers look very deeply at the data received from the telescope for weak signals, nor do they look for a large class of signal types. The reason for this is because they are limited by the amount of computer power available for data analysis. To tease out the weakest signals, an enormous amount of computer power is necessary. SETI programs could never afford to build or buy that computing power.