That is just a platitude.
The President and his/her administration most definitely have a role to play in upholding religious liberty and preventing religious persecution both at home and abroad.
For example, how does the 1st Amendment protect Jews (and Muslims) in Israel?
Furthermore, the Constitution doesn't prevent religious persecution at all. It simply prevents the GOVERNMENT from doing it. So, for example, a Catholic school is perfectly within its rights to fire a teacher who turns out to be Muslim or converts to Islam. Nothing in the Constitution prevents that sort of thing. There are some anti-discrimination laws that prevent some of that sort of religious discrimination. But they are anti-discrimination statues and not part of the Constitution.