The message of God is: That Jesus Christ came as God (Deity) in the flesh and humbled Himself to die (a substitute) in our place as a sinless, perfect, and finished sacrifice, and through His blood to pay the penalty (redemption) of our sin and to satisfy (propitiate) the wrath of God upon sin. He rose from the dead in the (resurrection) power of the Holy Spirit to declare (impute) His righteousness to those who will believe and trust Him as Lord and Saviour. His offer is eternal life to sinners who repent and have faith in who He is and what He did.
We are not alone the Arecibo message sent by Carl Sagan never made it to its destination, the angels had the return message already planned. I broke this up into four posts Part1, Part2, Part4, Part5.