I don't understand what "believe in" means.
I love God. I talk to Him/Her/It every day, and listen. I am comforted and I learn to dwell in peace and act in love and offer wisdom.
I see wonderful gifts in all religions, and in science, agnosticism, and atheism, too.
Sadly, I also see hurt and confused brothers and sisters suffering and causing harm.
May we all know and share peace and joy.
it's in the doing, I think, not so much the believing.