That is quite a narrow-minded statement. You think if chrstianity is wrong, then every religion must be? Including religions older than chrstianity? Including the religion from which chrstianity pilfered the Bible in the first place.
Seriously, dude . . . atheism and agnosticism are not your only alternatives.
Judaism ceased to exist 2000 years ago. Old Testament Judaism is NOT the Judaism practiced today. The latter is a false religion. Not an option, sorry.