Q1 :How do the scriptures define Church
its the people NOT A BUILDING ! (the building is for comfort aganst wind sun rain etc)...
Ro 12:5 So we, [being] many, are one body in Christ, and every one members one of another.
1Co 6:19 What? know ye not that your body is the temple of the Holy Ghost [which is] in you, which ye have of God, and ye are not your own?
1Co 12:12 For as the body is one, and hath many members, and all the members of that one body, being many, are one body: so also [is] Christ.
1Co 12:14 For the body is not one member, but many.
1Co 12:18 But now hath God set the members every one of them in the body, as it hath pleased him.
1Co 12:20 But now [are they] many members, yet but one body.
1Co 12:25 That there should be no schism in the body; but [that] the members should have the same care one for another.
1Co 12:27 Now ye are the body of Christ, and members in particular.
1Pe 2:5 Ye also, as lively stones, are built up a spiritual house, an holy priesthood, to offer up spiritual sacrifices, acceptable to God by Jesus Christ.
Ro 16:5 Likewise [greet] the church that is in their house. Salute my wellbeloved Epaenetus, who is the firstfruits of Achaia unto Christ.
1Co 14:23 If therefore the whole church be come together into one place, and all speak with tongues, and there come in [those that are] unlearned, or unbelievers, will they not say that ye are mad?
Col 4:15 Salute the brethren which are in Laodicea, and Nymphas, and the church which is in his house.
and more !!...
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Q2. With so many Christian Church's in the world all professing Christ how can we know who is God's true Church?
Those who (are anointed by the Holy Ghost) and preach the FULL GOSPEL !
Ac 2:38 Then Peter said unto them, Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost.
Ro 8:9 But ye are not in the flesh, but in the Spirit, if so be that the Spirit of God dwell in you. Now if any man have not the Spirit of Christ, he is none of his.
Mark16v16 He that believeth and is baptized shall be saved; but he that believeth not shall be damned.
17 And these signs shall follow them that believe; In my name shall they cast out devils; they shall speak with new tongues;
18 They shall take up serpents; and if they drink any deadly thing, it shall not hurt them; they shall lay hands on the sick, and they shall recover.
etc...package deal (accsess to all) upon recieving the Holy Spirit ! true believers not those who make excuses why not !! it is the same today NOT RELIGIOUS TYPES !
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Q3. How does the bible define as God's people?
(see above mark 16 above God gets in your face real !!!!)(that is the reciept from God that you are what you say = christian = christ ones = anointed ones.)
Joh 4:24 God [is] a Spirit: and they that worship him must worship [him] in spirit and in truth.
Joh 17:17 Sanctify them through thy truth: thy word is truth.
so according to the word (worship in spirit)
1Co 14:14 For if I pray in an [unknown] tongue, my spirit prayeth, but my understanding is unfruitful.
and more...
when a baby is born (norm) it cries out ; when a person is born again (from above) he also cries out in the pure (undefilable) language God gives to them.
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Q4. Who is God's ISRAEL in the new covenant?
there is 2 natural (hebrews etc God rejected as they killed Christ so far from God had they gone and still, trying like so many to appease by the Law which no one (except Jesus Christ ,who fulfilled the Law and the Prohets) can keep for any length of time. and the Spiritual new test.The Law was perfect;man imperfect,easy to corrupt..
2Co 3:6 Who also hath made us able ministers of the new testament; not of the letter, but of the spirit: for the letter killeth, but the spirit giveth life.
Ro 2:28 For he is not a Jew, which is one outwardly; neither [is that] circumcision, which is outward in the flesh:
Ro 2:29 But he [is] a Jew, which is one inwardly; and circumcision [is that] of the heart, in the spirit, [and] not in the letter; whose praise [is] not of men, but of God.
God will deal with both.
etc...........
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Q5. Who is Gods Church according to the scriptures in the New covenant?
as above...
Ga 3:28 There is neither Jew nor Greek, there is neither bond nor free, there is neither male nor female: for ye are all one in Christ Jesus.
Col 3:11 Where there is neither Greek nor Jew, circumcision nor uncircumcision, Barbarian, Scythian, bond [nor] free: but Christ [is] all, and in all.
and much more...
get the Holy Spirit and let God show you he will lead you and teach you all things that lead to life and Godliness..
Ac 8:18 And when Simon saw that through laying on of the apostles’ hands the Holy Ghost was given, he offered them money,
this passage shows he saw and heard ,a con artist willing to pay !! not just sign a card ,make a decision, pie in the sky nonsense REAL IN YOUR FACE EVENT even today.
Heb 13:8 Jesus Christ the same yesterday, and to day, and for ever.