Wrong. Assuming a 5:1 ratio of non Muslims to Muslims.
A Muslim person is statistically much more likely to date a non Muslim, since the latter are in abundance.
A non Muslim is statistically much less likely to date a Muslim, since the latter are rarer.
So in an ideal scenario, a minority group would marry way more majority group members, by percentage.
(Note- the issue is generally with the conservative family and society. Youngsters don't care about religion that much, unless forced by the family)