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The Bible also says to study to show yourself approved and not believe everything you hear but test the spirits and the doctrine
I believe it is good to go to church though
The entire Matt 18:17 is
Mat 18:11 For the Son of man is come to save that which was lost.
Mat 18:12 How think ye? If a man have an hundred sheep, and one of them be gone astray, doth he not leave the ninety and nine, and goeth into the mountains, and seeketh that which is gone astray?
Mat 18:13 And if so be that he find it, verily I say unto you, he rejoiceth more of that [sheep], than of the ninety and nine which went not astray.
Mat 18:14 Even so it is not the will of your Father which is in heaven, that one of these little ones should perish.
Mat 18:15 ¶ Moreover if thy brother shall trespass against thee, go and tell him his fault between thee and him alone: if he shall hear thee, thou hast gained thy brother.
Mat 18:16 But if he will not hear [thee, then] take with thee one or two more, that in the mouth of two or three witnesses every word may be established.
Mat 18:17 And if he shall neglect to hear them, tell [it] unto the church: but if he neglect to hear the church, let him be unto thee as an heathen man and a publican.
Mat 18:18 Verily I say unto you, Whatsoever ye shall bind on earth shall be bound in heaven: and whatsoever ye shall loose on earth shall be loosed in heaven.
Mat 18:19 Again I say unto you, That if two of you shall agree on earth as touching any thing that they shall ask, it shall be done for them of my Father which is in heaven.
Which is referring to someone who has fallen away from the faith rather than the church itself.
The Church teaches the faith and all who believe in this faith are members of His body, the Church: