Many people are taught that belief in Christ's blood should be enough, and that doctrinal differences aren't all that important in the grand scheme of things. What these people neglect to recognize is this: The more truth you know about God and His Kingdom, the less Satan can deceive you away from that Kingdom. Neglecting to continue learning biblical truths is why some have been deceived into building gay-oriented congregations (Romans 1:25-27), accepting Santeria (Leviticus 19:31), and allowing spiritistic practices into their churches (Deuteronomy 18:11-12).
The more truth you know, the less easy it will be for Satan to deceive you. Period.
GOD AND TRUTH
Our Creator is a God of truth (Psalms 19:9, Psalms 31:5, 2 John 4) (KJV,YLT), and He is a spirit who wants us to worship in truth (John 4:23-24). This means that we are to seek truth in our worship of Him (1 Timothy 2:3-4). We must be careful that we don't just pick and choose what we want to accept as truth, we must only accept that which is real truth. We must keep our senses in this regard (2 Timothy 4:3-5, 1 Peter 5:8-9). In order to know that we are worshiping in truth, we need to put all of our trust in God and His Word (Psalms 4:5, Psalms 118:8, Proverbs 3:5, Isaiah 26:4, Jeremiah 17:7).
We must continue to guard ourselves from falsehoods because if something isn't true then it's a lie, and God hates all lies (Proverbs 6:16-19) for He is not a liar (Titus 1:2, Hebrews 6:18). Remember, God is Love (1 John 4:8, 16), and Love rejoices in truth (1 Corinthians 13:6, 1 John 3:18) and no lie originates with the truth (1 John 2:21). Whereas Satan is a liar and the father of lies (John 8:44), which is in direct opposition to God's truthfulness. Scripture tells us that adhering to lies will be our death (Psalms 5:6, Proverbs 19:9, Romans 2:8). This makes sense because it is difficult to have true faith when you are living under lies. It is unacceptable to knowingly speak lies to one another (Zechariah 8:16-17, Ephesians 4:25, Colossians 3:9).
In order to be sure what we are being taught is godly truth, we need to abide by the biblical command to test all teachings (2 Corinthians 13:5, Ephesians 5:10, 1 Thessalonians 4:1, 1 Thessalonians 5:21). Even inspired utterances are expected to be tested (1 John 4:1) in order to be sure that the inspiration did not come from the wrong source (1 Timothy 4:1). This is because Satan disguises himself, and diligently tries to mislead us (2 Corinthians 11:13-15, Revelation 12:9). No one should condemn you for testing the teachings, for when the Beroeans did it they were praised for doing so (Acts 17:10-11) (ASV,HCSB).
TRUTH AND LIGHT
Only those who live by what they know to be true come to the light (John 3:20-21). To become one of God's people, we will walk in His ways of truth (Psalms 25:5, Psalms 86:11, 1 John 2:4). Christ said it was truth that would set us free (John 8:31-32). We need to clear away the "leaven" of falsehoods and hold fast to truth (1 Corinthians 5:6-8). True Christians will renounce the lies and make the truth manifest to everyone. They will declare the truth in order to shed light through the spiritual darkness that Satan cast upon the world (2 Corinthians 4:1-6). The fruitage of the light consists of truth, among other things (Ephesians 5:9). Speaking the truth is how we can grow in Christ (Ephesians 4:15). We are to wear truth as if it were armor (Ephesians 6:14). Our faith in truth can lead us to salvation (2 Thessalonians 2:13).
Many people will be condemned because they will not want to accept biblical truth, accepting Satan's lies instead (Psalms 4:2, 2 Thessalonians 2:9-12, 2 Timothy 4:3-4). In spite of that, Christians are to keep their senses and fully accomplish their ministry (2 Timothy 4:5).
Of course, we realize that at this time there is no perfect congregation because there are no perfect people (Romans 3:23). Therefore, seeking out the group that is 100% biblically correct will be impossible at this moment. However, this doesn't absolve individuals from seeking out as much biblical truth as they can; even though none of us are foolproof, we must continually seek truth in order to make protect ourselves from Satan's deceptions.
Although it may take effort on each individual's part, it is worth digging for scriptural truth. By doing so, we can please God, protect ourselves from Satan's deceptions, and grow in our love for the Lord.
Know that living according to true teachings as best we can will be a blessing to us (Psalms 40:4), that despite the opposition we may receive over it (1 Peter 4:4, 2 Peter 2:2), we will make God's heart happy! (Psalms 147:11).
May God continue to bless you in your search for His Truth!