Whatever the issue, holding a different opinion to the majority should not, and does not (in itself) disqualify a person from any position in Parliament. However, that is only half the story, or even less than half.
It matters a great detail whether you then attempt to impose your view on the people bia legislation and the fear of that could disqualify him. Then there is the problem thar MPs need to get elected and topics like this candamage a party (cf Rim Farron)