The word translated 'church' (
ἐκκλησία) means a called out assembly, which is what the believing election in Israel were, ie, believers called out of the world to follow their king.
G1577
ἐκκλησία ekklesia (ek-klee-siy'-a) n.
1. (literally)
a “calling out.” (see H4744 for usage in Israel).
2. (concretely, of Greece) an assembly of citizens (as called out by the town crier for a specific purpose).
[from a compound of G1537 and a derivative of G2564]
G1537
ἐκ ek (ek) prep.
ἐξ ex (ex)
1.
out (of a place, time, or cause).
2. from out (of the point whence action or motion proceeds), forth.
G2564
καλέω kaleo (ka-le'-ō) v.
1.
to call (aloud).
This is the same word describing the assembly of Israel in the wilderness who were called out of Egypt.
This is he [Moses], that was in the church in the wilderness (ἐκκλησία) with the angel which spake to him in the Mount Sinai, and with our fathers: who received the living writings to give unto us: Acts 7:38
Even Jesus was a called out one
And [Jesus] was there until the death of Herod: that it might be fulfilled which was spoken of the Lord by the prophet, saying, Out of Egypt have I called my son. Matthew 2:15
Which all relates to this
Wherefore the rather, brethren, give diligence to make your calling and election sure: for if ye do these things, ye shall never fall: 2 Peter 1:10
The word church is just an unfortuante choice of words used by the Roman Catholic church