Some argue that the Bible is contradictory concerning whether marriage is good.
Then the Lord God said, “It is not good that the man should be alone; I will make him a helper fit for him.”
Genesis 2:18
1 Now concerning the matters about which you wrote: “It is good for a man not to have sexual relations with a woman.”… 7 I wish that all were as I myself am. But each has his own gift from God, one of one kind and one of another… 8 To the unmarried and the widows I say that it is good for them to remain single, as I am… 26 I think that in view of the present distress it is good for a person to remain as he is.
1 Corinthians 7:1, 7, 8, 26
When Paul suggests that Christians should not get married in 1 Corinthians 7, he does so in the context of the coming judgment and persecution in AD 70. He knows that suffering and difficult times are coming soon, so he offers advice that will mitigate the amount of difficulty Christians will experience.
This does not at all contradict the clear teaching of Scripture that God created marriage to be a good thing, and that in general, humans should pursue the blessing of marriage.
There are some foundational principles that apply to all alleged and apparent contradictions in the Bible. To read more, see Bible Difficulties: Foundational Principles.
To read more answers to alleged and apparent contradictions in the Bible, see “Contradictions” in the Bible Answered.
These books are also excellent resources:
Evidence That Demands a Verdict: Life-Changing Truth for a Skeptical World - Josh and Sean McDowell
Little Pilgrim's Progress (Illustrated Edition) - Helen L. Taylor