Would aliens invalidate Christianity as we know it? If we discover other intelligent life forms in the universe, would this change Christianity in any way or not?

For the sake of the argument, let's presume we will find human-like life in a newly discovered planet in our solar system.
It wouldn't change Christianity it all.  The Bible does not suggest that it contains all knowledge and all revelation.  There is a lot it does not reveal.

The presence of other intelligent life elsewhere in the universe would not change our own reality, which includes the following:


The Eternal Triune God created the universe of time, space and matter and everything in it.
Mankind was created in the image of God.  (Genesis 1:26-27)
Mankind sinned against God and thereby incurred God's punishment.  (Genesis 3)
God the Son, the Third Person of the Trinity, entered into creation through the virgin birth and then received the name Jesus (Yeshua/God saves).
Jesus died on the Cross to take upon Himself the punishment incurred by us.
By faith in Jesus, Christ's work on the Cross is credited to our account, freeing us from the penalty of sin and making us sons and daughters of God.
There is a final judgment for every person where those who follow Christ are rewarded and those who reject Christ will pay the penalty for sin themselves.


This is the reality for us.  The reality for other intelligent life would have no impact on our reality, other than that our reality would acknowledge that there was other intelligent life.

Is it impossible for God to enter into His creation again?  No.  It wouldn't matter to us if He did, though.

So, no, Christianity would not change at all.