Actually, they can't be both true as a whole. As a Muslim, I believe that Islam is the only true religion today & until the day of Judgement. I also believe that the original Christianity & the original Judaism as well as every Divine message conveyed by a prophet is true as they all represent Islam itself in its main teaching (The Oneness of God).
Answer this question… Islam
Islam, Judaism and Christianity.
Christianity, Islam
Islam, Christianity
Because of its claims to have the Fullness of Truth about God. Same with Islam. People when seeking religion, seek out the Truth about the meaning of life.
Judaism, Christianity, and Islam have all claimed the Holy Land for themselves.
The Bible is to Christianity as the Qur'an (Koran) is to Islam.
Christianity, but Islam may overtake Christianity relatively soon.
Christianity is to Bible as Islam to Quran.
Judaism, Christianity, and Islam religions.
Both Islam and Christianity originated out of Judaism.
Christianity is not against Islam, though it does conflict upon the basis of faith. But from the Islamic perspective Christianity it self gives testimony for the Last prophet of Islam.