is it compulsary?

I don't know how much he is into the Islam. For a true Muslim he should marry only a Muslim. There are some options in worst cases. If she believe in true one God only and of Jews or Christians then a Muslim man can marry that woman if he has no another option. However he cannot force you to become a Muslim, or he cannot marry your if you are not a Muslim. If he truly love you he would love to see you following the guidance of God and in paradise as well. Islam is not just something that is to be done in mosque or secret. It is the total way of life. A vehicle can't run properly if one tyre is of a truck and other is of a car. And the same way the family as well. 'Wed not idolatresses till they believe; for lo! a believing bondwoman is better than an idolatress though she please you; and give not your daughters in marriage to idolaters till they believe, for lo! a believing slave is better than an idolater though he please you. These invite unto the Fire, and Allah inviteth unto the Garden, and unto forgiveness by His grace, and expoundeth thus His revelations to mankind that haply they may remember." (Quran : Al-Baqarah 2: 221) This day are (all) good things made lawful for you. The food of those who have received the Scripture is lawful for you, and your food is lawful for them. And so are the virtuous women of the believers and the virtuous women of those who received the Scripture before you (lawful for you) when ye give them their marriage portions and live with them in honor, not in fornication, nor taking them as secret concubines. Whoso denieth the faith, his work is vain and he will be among the losers in the Hereafter." (Al-Ma’dah 5: 5) A woman is chosen as a wife for her wealth, beauty, family, and faith. Win the one that has the faith or you would ruin your life. (Prophet Mohammad).

my bestfriend is a muslim. when we talked about this, she said it's not compulsary. it would be ideal though to learn the religion as you would be embracing not just a culture but a deeper understanding of beliefs and practice. former colleagues has recently wed... twice last december. the guy is an indonesian muslim and the girl is a catholic from mindanao. they had a catholic church wedding in the philippines, and a muslim wedding in australia where the guy works at present. so i think couples nowadays don't make it a mandatory to convert to muslim beliefs or christianity if ever they have different religions. what matters is respect between the two and respect in their beliefs and culture.

What country are you in? I think it is the law in some places. I have a Muslim step-son-in-law. My step-daughter did convert when she married him, but it was her choice. He did not command her to do this. They were in the USA at the time. I think it all depends on the country, and the individuals themselves. I would never convert for someone, nor would I ask them to convert for me.

Islam is a whole different thing from Christian. Aside from using different text, they have different culture/tradition as well.. The reason maybe why one of you must convert to another religion is to choose which of the two faiths you will teach to your children. I think you and your fiance should discuss this matter, because in marriage its not all about love, it is more than that...

The holy Quran Says "there is no compulsion in religion". In Islam we never call it as religion. Muslim call it as "Deen" which means "Way of Life". And Islam says dont blindly enter this religion. Instead think, research and then if you wish you can enter this religion otherwise not.

There is an Islamic law that a person of Muslim community can marry "the people of Book"(i.e Christians & Jews). Muslim also believes in Jesus Christ(peace be upon him) as one of the mightiest messenger of Almighty God. Muslims also believe in Adam, Noah, Abraham, Moses, John, Joseph, Issac (peace be upon them all) as messengers of Almighty God. More than 2.5 billion muslim population in the world accept Jesus(pbuh) as Messenger as Messiah.