There was no church before the foundation of the world, which is when election occurred. I think you are conflating two different
subjects.
[Eph 1:4 KJV] 4 According as he hath chosen us in him before the foundation of the world, that we should be holy and without blame before him in love:
There are a number of ways to read that verse (Ephesians 1:4) as shown below.
[Eph 1:4 KJV] 4 According
as he hath chosen us in him before the foundation of the world, that we should be holy and without blame before him in love:
Chosen to love others and not chosen to be saved.
Here is another way of reading that verse.
[Eph 1:4 KJV] 4 According
as he hath chosen us in him before the foundation of the world, that we should be holy and without blame before him in love:
Everything is sourced and holds together
IN HIM. That includes our salvation because Jesus was predestined from eternity.
So '
anyone who calls on the Lord is saved'
IN HIM.
It is good to be aware that there are multiple ways to read the scripture.
I have two problems with Calvinism.
1) God is not partial towards anyone, God is never, ever partial.
2) Everything God does is through His love for humanity.
God is love and there is no other way of understanding Jesus.