Welcome Truthseeker, I can relate well to how you're feeling. It wasn't long ago I was there myself. The fact is there is a place God's word hasn't been tarnished. It's all to close and it's called your heart! The very thing they teach you not to trust. You're intellect can be fooled but not your heart.
Simply ask yourself how something makes you feel. For me if it's true or from God :
God, True : you feel joyous, happy, strong, peaceful, free, alive
vs.
Man,false: you feel sad, guilty, weak, anxious, fearful, bound, dying
Or just make comparative statements and reason on which rings "true"
Example: God is not partial, loves all his children equally
or
God is partial, has favorites, loves some more than others
Another: God's love is unlimited and unconditional
or
God's love is limited and conditional
For me finding "truth" is easier than ever. Trust yourself! No one else.