I'm a Conservative Jew, not Orthodox.
We count the days from Pesach to Shavuot as commanded by G-d (Lev 23:15-16 and Deut 16:9-10). Every night from from the second night of Pesach to the night before Shavu'ot, we recite a blessing and state the count of the omer. The count reminds us that the redemption from slavery was not complete until we received the Torah. Shavuot is the Festival of the Weeks, not the feast of weeks. It occurs on the 50th day.
We count the days from Pesach to Shavuot as commanded by G-d (Lev 23:15-16 and Deut 16:9-10). Every night from from the second night of Pesach to the night before Shavu'ot, we recite a blessing and state the count of the omer. The count reminds us that the redemption from slavery was not complete until we received the Torah. Shavuot is the Festival of the Weeks, not the feast of weeks. It occurs on the 50th day.