“We can’t know for sure what are Paul’s opinions and what instruction are from God.” “We’ll probably never be able to know which apostles were guided by the Spirit, since they contradict each other.” “We can’t know without a doubt what books belong in the Bible.” “We can’t be absolutely sure about what instructions to follow in the Bible since there may be some books missing.” “No one knows for certain what Jesus actually said.” These are all assertions. Statements promoted to produce doubt.
These are the thoughts that are even being taught in many buildings bearing the name of Christ. All they want is little bit of doubt. They want to shake the ground of truth that you stand on, and then offer to hold you up on their own thinking. These assertions are not worth conjecturing. There is no basis for accepting them.
None of these statements should faze Christians. Paul claimed to speak God’s commands and Peter agreed (1 Cor 14:37; 2 Pet 3:16). The Apostles did oversee and confirm the collection of the New Testament. The New Testament writers did not contradict each other. Peter referred to Paul, and Paul referred to Luke. Luke referred to the Gospels most likely including Matthew and Mark (Luke 1:1–3; 1 Tim 5:18; 2 Pet 3:16). The apostle John wrote about the Apostles writing Scripture, “And we are writing these things so that our joy may be complete” (1 John 1:1–4). Everything people know about Jesus and what He said is through the written Gospels, and Jesus declared that His words would never pass away (Matt 24:35). Christians can have no doubt with absolute certainty that “Every Scripture is God’s breath and is profit for teaching, for reproof, for correction, for instruction which is in righteousness. That the person of God would be complete, equipped completely unto every good work.”
Grace and peace to you all in Christ.
Seeing God's Breath 
So they say! Paul certainly made it clear when he was speaking of his own accord. The rest of what he wrote was direct instruction from God.
There seems to be a modern bent toward disqualifying Paul as a true Apostle, much like Paul’s opponents in the first century.
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You’re right though these are assertions coming from so-called teachers, preachers, and instructors of Christ.
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Those aren’t assertions. They are very simply lame excuses by people who want to live their lives their way and follow their own rules. It won’t stand at the judgment!
Whenever I run into someone who picks and chooses what they believe from the Bible, I say “Believe it all, or not at all.”
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