Thats not faith, incredible heat is a mathematical necessity for something to be that dense

And given that the universe is provably expanding (all cosmologic bodies exhibit red shift) its also logical to trace that back to the beginning of expansion. The force required to keep everything expanding is massive and mathematically fits with the expansion of an infinitely dense singularity.

Also, that level of energy left a signature in the form of cosmic background radiation.

No real need for faith. Just an acceptance of the preponderance of evidence.