Faith
Belief
noun, verbal noun, の adjective
What you believe in your heart, and not in your head, is your faith. This is something that doesn't follow logic, it's all heart belief, it's all faith.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well. Just note that しん changes to じん.
私の母は信心深い人です。
My mother is a deeply religious person.
いいですか、皆さん。信心を大切にすることで、心が強くなるんです。
Alright, everyone? By cherishing faith, our hearts become stronger.
私は神への信心がある人ともない人とも、みんなと助け合って生きていきたいです。
I want to live by helping others, whether they have faith in God or not.