I'm an not a religious person, but i am a very spiritual person, being a philosopher, and i meditate and question existence and etc. Knowing yourself is essential to being a good fighter, because there are two people in the ring in a fight.
And the person you are beating that particular day.
If you know yourself, then you know you're gonna beat your opponent.
The best don't talk in ifs and maybes, they talk in terms of "I will" and "He won't."
The best are already training for their next fight because they know they've already won.
In my personal opinion, i don't think relying on God in a fight for him to interfere in his Providence is going to happen, the only person who makes their Providence is themselves.
In sum, religion and spirituality are important to your mindset, but the only person you can rely on is yourself, and thats simply empirical truth.