Q:

How do you know that you are in the True Church?

A:

Firstly, the "True Church" is the church where God's Word - The Holy Bible (not some member of church hierarchy) is the only authoritative source of that organization's teachings; for as Jesus said - 

"in vain do they worship me, teaching as doctrines the precepts of men." [Mt 15:9]
Secondly, "True Christians" are people who not only believe in Christ, but also repent and do as He has told us - "KEEP HIS COMMANDMENTS" - meaning live life in accordance to them.
"By this we may be sure we are in him, if we keep his commandments." 1Jn 2:3
"Repent and believe the Gospel" Mk 1:15
"And why call ye me, 'Lord, Lord', and do not the things which I say?" Lk 6:46
"Not every one who says to me, 'Lord Lord', shall enter the Kingdom of Heaven, but he who does the will of my Father who is in Heaven.  On that day many will say to me, 'Lord Lord' did we not prophesy in your name, and cast out demons in your name, and do many mighty works in your name? And then I will declare to them, I never knew you; depart from me you evildoers!"  Mt 7:21-23
As the above scriptures (direct quotes from Jesus himself) make clear, you can believe in the Savior and still be spiritually mislead by taking part in religious observances and practices that have nothing whatsoever to do with, and in fact are most often directly opposed to God.
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