it appears to me that when reading the bible that the fire of the sacrificial altar of the temple was originally sent from heaven? When the temple is rebuilt will the fire come down from heaven similar to Elijah...the G_d who answers?

Also at the consecration of the Mishkan heavenly fire was sent, but it is not inevitably going to be so when the third temple is built, we might need to light it ourselves. Rabbi Ro'i Margalit