Believe it or not, theologians,
astronomers, and science fiction fans and writers
have contemplated this question long and hard.
The debates have narrowed down where the
problems would arise, but the variables prevent a
definitive answer.
The most commonly discussed issue is that of the
identity and work of Jesus. God sent His only
begotten Son, God incarnate, to save mankind
and redeem creation. Does that redemption
include life on other planets? Or would God have
manifested Himself on those other planets, as well
(in the manner of Aslan in Narnia)? Does "only
begotten" mean "only physical representation"?
Or is it more limited, referring only to the human
species?
Another consideration: would an otherworldly,
sentient, advanced life form sin and need
redemption in the same way we do? Human life is
in the blood (Leviticus 17:11). Where is the life of
these hypothetical aliens? And what would have
to be sacrificed to save them? Could the human
blood of Jesus save silicon-based glass creatures
whose sin was melting and reforming themselves
into unnatural shapes?
Another topic of discussion is what it means to be
made in the "image of God." Since God has no
physical body, we take this to mean a reflection of
God’s non-physical aspects—rationality, morality,
and sociability. Would aliens embody the same
characteristics? We have no way of knowing.
One issue rarely broached is the impact of Young
Earth Creationism on the discovery of alien life. It
is conceivable, if highly unlikely, that the
geological pyrotechnics that took place during
the global flood could have spewed a bacteria- or
lichen-tainted stone all the way to Mars where it
found shelter in a misty canyon. But any life form
more complicated or farther out would be much
harder to harmonize with a literal reading of
Genesis 1. Could demons have taken trees and
shrubs and rodents and bugs to another planet
with an environment similar to Earth’s? Possibly.
But without the Spirit's blessing of life, it's unlikely
any of it would have survived. Parallel creations?
Maybe. The Bible does not mention parallel
creations, but, then again, there's no reason why
God would have to tell us about them.
If a more advanced race is found, it would be
interesting to see if they had stories about
creation, sin, redemption, and an omnipotent, all-
seeing Deity. If so, the Bible would have even
more external validation. If not, then we have
another mission field.
Considering what we know about space and life
and the world as God sees it, we already have an
explanation for so-called alien activity on Earth.
Reports of “close encounters” describe the
ethereal, transient, deceptive, and malevolent.
Accounts also record that encounters with
supposed aliens can be stopped by a real,
authentic call to Jesus. Everything points to the
activity of demons, not extraterrestrials.
The discovery of alien life would have no effect on
genuine Christianity. The Bible stands as written,
and there is nothing in it that would absolutely
contradict the existence of extraterrestrials. If
aliens exist, they exist within God's framework for
creation. God cannot be hurt by truth, and those
who walk by faith love the truth. John 16:13
assures us that the Spirit will guide us to all truth.
Nothing that happens in this universe is a
surprise to God. If aliens exist, God will let us
know what to do with that information when the
time comes.

That wont affect my Faith in Jesus Christ.It definately add to my believe that Jesus is the ruler of all Universe

Hmmmmm