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(All quotations from the King James translation unless stated otherwise).
A person who uses bad language is not following the example or commandments of Christ and the apostles.
Matthew 5:37 But let your communication be, Yea, yea; Nay, nay: for whatsoever is more than these cometh of evil.
Romans 12:14 Bless them which persecute you: bless, and curse not.
Ephesians 4:29 Let no corrupt communication proceed out of your mouth, but that which is good to the use of edifying, that it may minister grace unto the hearers.
Colossians 3:8 But now ye also put off all these; anger, wrath, malice, blasphemy, filthy communication out of your mouth.
Colossians 4:6 Let your speech be alway with grace, seasoned with salt, that ye may know how ye ought to answer every man.
Titus 2:7 In all things shewing thyself a pattern of good works: in doctrine shewing uncorruptness, gravity, sincerity, 8 Sound speech, that cannot be condemned; that he that is of the contrary part may be ashamed, having no evil thing to say of you.
James 3:10 Out of the same mouth proceedeth blessing and cursing. My brethren, these things ought not so to be.
The use of bad language generally indicates a serious lack of understanding of the gospel of Christ. If we do not obey the gospel of Christ and keep his commandments we will not inherit the kingdom of God.
If you want to come to grips with what the Bible really teaches, why not take the free Bible study course available on www.thisisyourbible.com? This course will give you a background in the major themes of the Bible from Genesis to Revelation.
As with everything we offer, there is no cost to you other than your time and effort. You will also have a personal tutor to whom you may pose questions either from the course itself or those questions which come to you as you read the Bible.
I hope this helps.