Is profanity needed while being harsh?
Absolutely NOT!
Can you get your point across without?
Absolutely! I and others do it all the time.
Is there a line that we as Christian men and woman should avoid crossing?
II Corinthians 6:17:
Wherefore come out from among them, and be ye separate, saith the Lord, and touch not the unclean thing; and I will receive you,
Why would one want those "unclean" words to touch your tongue?
We should come out from among the world, and NOT cross the line of looking (<--- and even that's up for debate), and or talking the same as the world.
you will have to define what profanity is.
F, S, BIT, SOB, BAS, PU, CU, so on and so forth. Why would one talk like the world? YaHWeH is capable of giving one a NEW tongue, so that we DON'T sound like the world.
Ephesians 5:4:
Neither filthiness, nor foolish talking, nor jesting, which are not convenient: but rather giving of thanks.
Filthiness
Strongs: G151
151 aischrotes ahee-skhrot'-ace
from
150; shamefulness, i.e. obscenity:--filthiness.
Colossians 3:8:
But now ye also put off all these; anger, wrath, malice, blasphemy, filthy communication out of your mouth.
Filthy
Strongs: G148
148 aischrologia ahee-skhrol-og-ee'-ah
from
150 and
3056; vile conversation:--filthy communication.
Proverbs 4:24:
Put away from thee a froward mouth, and perverse lips put far from thee.
Froward
Strongs: H06143
6143
עקּשׁוּת
[‛iqqeshûth] \ik-kesh-ooth'\
From
6141; perversity: - X froward.
Perverse
Strongs: H03891
3891
לזוּת
[lezûth] \lez-ooth'\
From
3868; perverseness: - perverse.
Deuteronomy 14:2:
For thou art an holy people unto the LORD thy God, and the LORD hath chosen thee to be a peculiar people unto himself, above all the nations that are upon the earth.
Titus 2:14:
Who gave himself for us, that he might redeem us from all iniquity, and purify unto himself a peculiar people, zealous of good works.
I Peter 2:9:
But ye are a chosen generation, a royal priesthood, an holy nation, a peculiar people; that ye should shew forth the praises of him who hath called you out of darkness into his marvellous light:
Philippians 4:13:
I can do all things through Christ which strengtheneth me.