Whether or not all religions are equally useless for truth and morality is a big and absolute statement. I can’t say that I agree or disagree because I’m not familiar with every religion.

I don’t think you have to know all religions to be able to say that. You just need to know what religion is and how it works. Religion can’t be the source of truth because it’s based on faith, not truth. If you look for truth without any dogma restricting your research you’re a scientists, not a theologian. Religion can’t be the source or morality because it’s goal is to enrich and empower the people that control it, not to teach anything useful. If you teach about morality without demanding obedience and money from your followers you’re a philosopher, not a religious leader.