You are completely ignorant in this occasion.Islam doesn't allow Muslims marriage to non-Muslims until the latter converts to Islam.<quoted text>
Islam allows Muslim men to marry Christian or Jew girls. Why do they force the girls to convert to Islam? The conversion of the non muslim wife to islam is not obligatory.
One can get this fact by reading the verse 221 of chapter al baqra of Quran.
Albeit some moderate Muslims marry non-Muslims without making their spouses discontinue their faith,that doesn't mean Islam allows marrying kaffirs.