Q. How can we know for certain what is absolutely true in Bible teaching? Should we not just accept everyone, and not bind our views on others?
These verses will make it clear:
John 8:32 (NAS95)
32 and you will know the truth, and the truth will make you free.”
1 Thessalonians 5:20-21
20 do not despise prophetic utterances.
21 But examine everything carefully; hold fast to that which is good;
1 John 4:1
4:1 ¶ Beloved, do not believe every spirit, but test the spirits to see whether they are from God, because many false prophets have gone out into the world.
11 Now these were more noble-minded than those in Thessalonica, for they received the word with great eagerness, examining the Scriptures daily to see whether these things were so.
1 Timothy 4:1-3
4:1 ¶ But the Spirit explicitly says that in later times some will fall away from the faith, paying attention to deceitful spirits and doctrines of demons,
2 by means of the hypocrisy of liars seared in their own conscience as with a branding iron,
3 men who forbid marriage and advocate abstaining from foods which God has created to be gratefully shared in by those who believe and know the truth.
1 Timothy 4:6-11
6 ¶ In pointing out these things to the brethren, you will be a good servant of Christ Jesus, constantly nourished on the words of the faith and of the sound doctrine which you have been following.
7 But have nothing to do with worldly fables fit only for old women. On the other hand, discipline yourself for the purpose of godliness;
8 for bodily discipline is only of little profit, but godliness is profitable for all things, since it holds promise for the present life and also for the life to come.
9 It is a trustworthy statement deserving full acceptance.
10 For it is for this we labor and strive, because we have fixed our hope on the living God, who is the Savior of all men, especially of believers.
11 Prescribe and teach these things
2 Thessalonians 2:11-15
11 For this reason God will send upon them a deluding influence so that they will believe what is false,
12 in order that they all may be judged who did not believe the truth, but took pleasure in wickedness.
13 ¶ But we should always give thanks to God for you, brethren beloved by the Lord, because God has chosen you from the beginning for salvation through sanctification by the Spirit and faith in the truth.
14 It was for this He called you through our gospel, that you may gain the glory of our Lord Jesus Christ.
15 So then, brethren, stand firm and hold to the traditions which you were taught, whether by word of mouth or by letter from us.
We can know the truth when we love the Word of God enough to accept it, and it alone in matters of religion.