What does “oppositions of science falsely so called” mean?
Paul wrote his epistle "1 Timothy" about 63-64 C.E. and it is obvious from this epistle and others that even at this early stage of Christianity ,Christianity was influenced by false teachings, and so Paul was moved to caution Timothy from the contradictions and absurdities of so-called "knowledge." And so appealed to his close friend Timothy.
1 Timothy 6:20-21
20" O Timothy, guard what has been entrusted to you, avoiding worldly
and empty chatter and the opposing arguments of what is falsely called
“knowledge" . 21 which some have professed and thus gone astray from
the faith.”—(NASB)
"What is falsely called “knowledge" .
Christians in those days were faced with the Philosophies and the teachings of the famous Greek philosophers such as Plato, Aristotle and Socrates . The elite intellectuals, disciples of such teachers were considered far superior scholarly to Jesus disciples , who were not considered " wise according to the flesh"(1 Cor. 1:26 NASB)
During his visit to Athens ,Paul encountered Epicurean and Stoic philosophers, neither of them believed in the resurrection ,to those philosophers the teachings of Crucifixion and resurrection were "absurd- foolishness." Paul wrote:
Acts 17:18 (NET Bible)
" Also some of the Epicurean and Stoic philosophers were conversing
with him, and some were asking, “What does this foolish babbler want
to say?” Others said, “He seems to be a proclaimer of foreign gods.”
(They said this because he was proclaiming the good news about Jesus
and the resurrection.)
1 Corinthians 1:23 (AMPC)
23 "We preach Christ (the Messiah) crucified, [preaching which] to the
Jews is a scandal and an offensive stumbling block [that springs a
snare or trap], and to the Gentiles it is absurd and utterly
unphilosophical nonsense."
Many people in those days esteemed the Greek philosophies , Paul called such knowledge "false" because it lacked godly wisdom, "but fools despise skillful and godly Wisdom, instruction, and discipline." (Proverbs 1:7 AMPB) Paul further wrote, warning Christians not to be impressed by the persuasive arguments of the intellectuals of the day.
Warnings Against the Adoption of False Philosophies
Colossians 2:4-8 (NET Bible)
4 "I say this so that no one will deceive you through arguments that
sound reasonable. 5 For though I am absent from you in body, I am
present with you in spirit, rejoicing to see your morale and the
firmness of your faith in Christ."
6 "Therefore, just as you received Christ Jesus as Lord, continue to
live your lives in him, 7 rooted and built up in him and firm in your
faith just as you were taught, and overflowing with thankfulness. 8 Be
careful not to allow anyone to captivate you through an empty,
deceitful philosophy that is according to human traditions and the
elemental spirits of the world, and not according to Christ."
Conclusion:
Today it is no different, we also have elite intellectuals with their theories of evolution, others doubt the "flood", many also question the sun and the moon being motionless in the days of Joshua. (Joshua 10:12-14).
Even today with our progress in science, humans cannot understand the workings of the universe, God asked Job: "Do you know the laws of the heavens, or can you set up their rule over the earth?(Job38:33). The earth and the sun may have continued their motion as usual,is it not possible for the creator of the universe for example, to refract the light in a way we do understand?
The humble will take time to read the scriptures and harmonize their lives with His never changing standards, rather that question the words and works of their Creator. David wrote:
Psalm 8:3-4 (NET Bible)
3 "When I look up at the heavens, which your fingers made, and see the
moon and the stars, which you set in place, 4 Of what importance is
the human race, that you should notice them? Of what importance is
mankind, that you should pay attention to them."