He has a strong belief in God.

他虔诚地信仰上帝。

He had a strong belief in God.

他坚定地信仰上帝。

This is my strong belief.

这就是我坚定的信念。

I hold strong belief in my promise.

我相信自己的诺言。

I have a strong belief in his honesty.

我对他的诚实绝对信任。