Not wise to take all scriptures literally - better to prayerfully compare them to decide more accurately what the Bible teaches on things

48 Be ye therefore perfect, even as your Father which is in heaven is perfect.
KJV
Taken literally, this means to be completely sinless - which none of us are able to be. Though yes, we can be counted as perfectly sinless through the forgiveness that comes through Jesus' blood on Calvary.

James 5:16
16 Confess your faults one to another, and pray one for another, that ye may be healed. The effectual fervent prayer of a righteous man availeth much.

Of course, we are not to willfully reject any of the scriptures, as God meant them all to be for us to learn from and they are all true. But prayerfully "rightly dividing" (II Timothy 2:15) the scriptures, helps increase likelihood that we interpret the scriptures correctly. . II Timothy 3:16.
Here are some examples:
Rom 16:16
16 Salute one another with an holy kiss. The churches of Christ salute you.
KJV
1 Cor 11:5
5 But every woman that prayeth or prophesieth with her head uncovered dishonoureth her head: for that is even all one as if she were shaven.
KJV
Comment: The ones above, have to do with ancient customs that were proper to adhere to back then - but improper or not required in modern times, due to changes in customs. Though the head covering for women still stands, except it is no longer to wear a visible head covering to show her respect for the headship of her husband. Instead, it is to be in her heart.
Matt 5:48
48 Be ye therefore perfect, even as your Father which is in heaven is perfect.
KJV
Taken literally, this means to be completely sinless - which none of us are able to be. Though yes, we can be counted as perfectly sinless through the forgiveness that comes through Jesus' blood on Calvary.
Rom 3:10
10 As it is written, There is none righteous, no, not one:
KJV
James 5:16
16 Confess your faults one to another, and pray one for another, that ye may be healed. The effectual fervent prayer of a righteous man availeth much.
KJV
Comment: The last 2 verses might appear contradictory to each other, due to their wording. But one needs to compare the scriptures in this to avoid being overly literal and to arrive at the correct meaning that these verses implies on the subject of righteousness.
Ex 20:8
8 Remember the sabbath day, to keep it holy.
KJV
Comment: If Christians thought that both the Old Testament laws and the New Testament laws both need to be obeyed - they'd find themselves failing to live according to the New Covenant, rather than the old one. The scriptures say that the old one is done away.

Not taking Scripture literally, one can make it say whatever they want.

If you're part of the twelve tribes scattered abroad during the tribulation, you would be wise to take this verse literally.

Indeed, that is also true! One needs to guard from interpreting it overly literally, just as much as they need to guard themselves from interpreting it overly loosely (to one's whims). One example I gave of taking the scripture too literally, is how some believe that one's should have church services only on Sabbath day (Saturday). And failing to take notice that the New Covenant has quite different laws, compared to the New Covenant. Or one could see in the Old Testament - that "women who commit adultery should be stoned to death." And think that law still stands! WHen it doesn't - under the New Covenant. Instead, people are to repent of their sins and to turn away from them.

Perfect never means sinless in the bible. Perfect means complete, not lacking anything, whole.

Good points for good study habits. Other areas of misunderstanding are symbolism and understanding prophecy and its reference in history.

Not taking Scripture literally, one can make it say whatever they want.

If you're part of the twelve tribes scattered abroad during the tribulation, you would be wise to take this verse literally.

Matt 5:48
48 Be ye therefore perfect, even as your Father which is in heaven is perfect.
KJV
Taken literally, this means to be completely sinless - which none of us are able to be. Though yes, we can be counted as perfectly sinless through the forgiveness that comes through Jesus' blood on Calvary.

John here does not believe the book of James was written to Jewish believers. He ignores such words as believer, brothers etc

this has skewed his view on the gospel

I'm still waiting on another example in the Bible where the term "twelve tribes" means something other than the nation of Israel as a whole. There are dozens of references. Just give one. One. I'll wait.

You're quite welcome to ignore the relevant context (author, overall message, cultural, historical, geographical, etc.) which all point to the letter being to Christians, but I see no reason to join you in your misunderstanding.

Comment: The ones above, have to do with ancient customs that were proper to adhere to back then - but improper or not required in modern times, due to changes in customs.

I'm still waiting on another example in the Bible where the term "twelve tribes" means something other than the nation of Israel as a whole. There are dozens of references. Just give one. One. I'll wait.