Depends on who you ask. Christians are absolutely forbidden from eating shellfish. But most Christians don't even know that. Christian women are REQUIRED to cover their heads also. But again, since most Christians don't know this and we have little cultural connection with the writers of the bible it is ignored. (Spoiler Alert Most Christians are going straight to hell, lol)
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The only way to be saved is through Jesus Christ, not works.
Ephesians 2:8
For by grace you have been saved through faith; and that not of yourselves, it is the gift of God; 9 not as a result of works, so that no one may boast. The bible doesn't talk about burning in hell forever and ever like most think:
THE BIBLICAL TRUTH ABOUT HELL