Will some claiming to be Christians go to hell?
According to Jesus, yes!
Think about these words of Jesus to some would be followers, "Not every one that said to me, Lord, Lord, shall enter into the kingdom of heaven; but he that does the will of my Father which is in heaven. Many will say to me in that day, Lord, Lord, have we not prophesied in your name? and in your name have cast out devils? and in your name done many wonderful works? And then will I profess to them, I never knew you: depart from me, you that work iniquity" (Matthew 7:21-23).
Are you sure that when you die you will go to heaven?
The Bible says you can be sure (1 John 5:12-13).
To help you think this through, please check out the following...
Jesus used parables (stories with a message) to explain how not all who appear to be believers are actually believers.
Matthew 13:24-30 The parable of the wheat and the tares
Another parable put he forth unto them, saying, The kingdom of heaven is likened unto a man which sowed good seed in his field: 25But while men slept, his enemy came and sowed tares among the wheat, and went his way. 26But when the blade was sprung up, and brought forth fruit, then appeared the tares also. 27So the servants of the householder came and said unto him, Sir, didst not thou sow good seed in thy field? from whence then hath it tares? 28He said unto them, An enemy hath done this. The servants said unto him, Wilt thou then that we go and gather them up? 29But he said, Nay; lest while ye gather up the tares, ye root up also the wheat with them. 30Let both grow together until the harvest: and in the time of harvest I will say to the reapers, Gather ye together first the tares, and bind them in bundles to burn them: but gather the wheat into my barn.