Well, first of all I forgot about that and I agree that it IS significant. But personal views and political agenda can of course be separate and usually are I would think.
The anti-liberalism part is to not tolerate a divergent view based on religious belief.
You may need to investigate liberalism a little more....
Liberalism also generally espouses secular government. So it’s completely fair, given Scheer’s record as a politician to try and legislate his religious views on others, to ask questions about it.