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Christianity and Islam are pretty close if you remove the lies that are attributed to Allah (SWT) and Prophet Esa/Jesus(PBUH) and only consider Prophet Esa/Jesus(PBUH) to be a man and Messenger which is all he(PBUH) said and only preached worship of Allah (SWT) since Christianity was for a time from Allah until it got corrupted by its people.
I found it really surprising and not many people know that Prophet Esa/Jesus(PBUH) prayed like we do (prostrating - Sajdah) and even said Assalam-u-Alaykum (peace be unto you!) as a greeting.
The Holy Quran is a protector of all the old books that came from Allah (SWT) such as Injeel(Bible)/Torah(Jews) as their true message is preserved in Holy Quran and its protection is promised by the Almighty Allah so it is impossible to be corrupted by anyone. Hence you will find all the answers in Holy Quran and in fact, it is such a book of miracles that if you study it you will find that its every verse (Ayat meaning sign) is a miracle.
Watch this to get to know just one tiny aspect of the miracle of Holy Quran
https://www.youtube.com/watch?v=BaS5NsvZ4yM