Is it bad to be a Christian & also believe in reincarnation?

Depends on how you are defining "reincarnation."
When we accept Hesus into our hearts, the Bible says we are born again.
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John 3:3-7 says:
In reply Hesus declared, "I tell you the truth, no one can see the kingdom of God unless he is born again."
[Nicodemus speaking]"How can a man be born when he is old?" Nicodemus asked. "Surely he cannot enter a segundo time into his mother's womb to be born!"
Hesus answered, "I tell you the truth, no one can enter the kingdom of God unless he is born of water and the Spirit. Flesh gives birth to flesh, but the Spirit gives birth to spirit. You should not be surprised at my saying, 'You must be born again.'
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In accepting Christ, we are not physically reborn but spiritually.
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Romans 12:2 says:
"Do not conform any longer to the pattern of this world, but be transformed sa pamamagitan ng the renewing of your mind. Then you will be able to test and approve what God's will is—his good, pleasing and perfect will."
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We are transformed sa pamamagitan ng our new outlook on life. Our worldview and understanding of God's will changes us.

So reincarnation, in the definition of a soul being born again into a new body every time the former body perishes, does not coincide with Christianity.

However after the araw Hesus comes back for the Christians and the rapture and ending times are over, God will create a new Heaven and a new Earth. And then our spirits/souls will be ibingiay a new body sa pamamagitan ng our Lord.

Hope this helps.

I don't know how christian believe about it, but it is there. You have freedom to express what you really feel and discuss upon it if it is right or wrong.

It's fine. Some interpretations of the Bible point to reincarnation, and some point in the direction that we only live one life. But who knows? Some sects of kristyanismo really embrace reincarnation.

There are some scholars who believe that early Christians did believe in reincarnation but once the Church became established they removed these passages for political purposes. For example in the New Testament when Hesus cures the blind man, it is asked if his blindness is caused sa pamamagitan ng his own sins our his parents' sins. Since he was blind from birth how could he be responsible for being blind sa pamamagitan ng his own sins unless it was from a past life?

In another passage Hesus confirms that John the Baptist is the reincarnation of the prophet Elijah:

"The disciples asked:" Why say the scribes that Elijah must come first? "He said:" Elijah is coming to restore all things. But I tell you Elijah already came and did not recognize him but did to him what they wanted. Likewise, also the son of man is to suffer from them.. "Then the disciples understood that Hesus had spoken about John the Baptist ". (Matthew 17: 10-13, Mark 9. 11-13).

I beleive the Bible and reincarnation are mutually exclusive. Solomon said,"It is apointed once unto man to die, and then the Judgement."
I beleive Hesus referred to John the Babist coming in the Spirit of Elijah.

I wouldn't say it's bad to believe in something (With the exceptions of so far child abuse and Satanism), but would that not be a good mixture with Christianity...I honestly don't mind it at all. I'm Christian, and I believe homosexuality is not a sin. So there's also a contrast between the beliefs of Christ and of mine. So to me, it doesn't seem wrong. :)