The US has not not funded Al Qaeda in Syria. The US has funded the Free Syrian Army, the Syrian National Coalition, and National Coalition for Syrian Revolutionary and Opposition Forces. The Al Qaeda front in Syria is Al Nusra and it has largely been taken over by ISIS which has been kicked out of the Al Qaeda network. ISIS and Al Nusra are at war with FSA which wants a democratic republic not a sharia state. Al Qaeda is anti-US and the US is anti-Al Qaeda. Anyone who tells you otherwise is either lying or has been lied to. Syria is 70% or so Sunni and much of the FSA has Islamist leanings so there has been a move by Islamist elements in the FSA to purge the secularists, liberals, and non-Sunnis from the ranks of FSA which has worried the opposition to Assad and it’s backers including the USA.