ATLANTA — The United States enters this weekend’s friendlies against Belgium and Portugal in fine form. But fine enough to upend their recent struggles against European (UEFA) competition? “We have a lot of guys on the team all playing in top European clubs. So we play these players every single week,” said Lake Grove-bred defender Joe Scally, who starts for German Bundesliga side Borussia Mönchengladbach after coming up with New York City FC. “We’ve all won at the highest of levels. “So I