Obama may be ok with Muslim prayer but not much other kind of prayer.
Regarding the  Jan. 2016  Ft Lauderdale type carnage committed by an ISIS jehadist shouting about Allah —  prayer  is insufficient says Obama.
Oh – so since you Obama have no faith in prayer, at least not the Christian sort, Americans should stop praying?
Remember that Obama abolished the national day of prayer Truman established in 1952?
Very recently  –on  January 5, 2017 —  Obama  wrote in the Harvard Law Review:
But as I’ve said many times: “ Our thoughts and prayers are not enough.â€
They [prayers]  alone won’t “capture the heartache and grief and anger we should feel,†and they do “nothing to prevent this carnage from being inflicted someplace else in America.†We have a responsibility to act.
In 1952 President Truman established one day a year as a “National Day of Prayer.”
In 1988 President Reagan designated the First Thursday in May of each year as the National Day of Prayer.
In June 2007 (then) Presidential Candidate Barack Obama declared that the USA “Was no longer a Christian nation.”
This year President Obama canceled the 21st annual National Day of Prayer ceremony at the White House under the ruse of “not wanting to offend anyone”
As for viability of Muslim prayer?  On September 25, 2009 from 4 AM until 7 PM, a National Day of Prayer for the Muslim religion  was Held on Capitol Hill Beside the White House.
So Muslim pray is OK Â –but all other prayer suspect?
Well — let’s keep President Obama in our prayers. Amen.