No man is excluded from calling upon God the gate of salvation is set open unto all men: neither is there any other thing which keepeth us back from entering in save only our own unbelief.
Faith makes all evil good to us and all good better unbelief makes all good evil and all evil worse. Faith laughs at the shaking of the spear unbelief trembles at the shaking of a leaf.
I am shy to admit that I have followed the advice given all those years ago by a wise archbishop to a bewildered young man: that moments of unbelief 'don't matter ' that if you return to a practice of the faith faith will return.
Obedience is an act of faith disobedience is the result of unbelief.
Talk unbelief and you will have unbelief but talk faith and you will have faith. According to the seed sown will be the harvest.
It's really amazing that in the age of unbelief as a smart man called it there isn't even more fraud. After all with no God there's no one to ever call you to account and no accounting at all if you can get away with it.