Are schismatics “least in the Kingdom of Heaven”?

Today’s Gospel reading from Mt. 5:17-19 applies to the “lesser commandments”.  Those who obey the “least of the commandments” are the greatest in Heaven:

Jesus said to his disciples:
“Do not think that I have come to abolish the law or the prophets.
I have come not to abolish but to fulfill.
Amen, I say to you, until heaven and earth pass away,
not the smallest letter or the smallest part of a letter
will pass from the law,
until all things have taken place.

But whoever obeys and teaches these commandments
will be called greatest in the Kingdom of heaven.”

. . . . .
What are the “least of the commandments”?   Catholic Fundamentalism respectfully suggests they are the implied instructions He provides to the most faithful.  For instance, Jesus told the first Pope, “Thou art Peter, and on this rock, I build My Church.”  That may be seen as a “lesser Commandment”.  He is clearly instructing us that He began One Church on one man.  That is a “lesser commandment” that we obey by being practicing Catholics.
. . . . . .
Another “lesser commandment”:  “If you do not eat My Body and drink My Blood, you do not have life in you.”
. . . . . .
 The only place to receive His Body and Blood is within The Church He founded on Peter.  Many people attend, and encourage others to attend, schisms that have separated themselves from The Church of which Peter was the first Pope.  There is no Body and Blood in schismatic groups.
. . . . . .
Those who fully obey and teach the “lesser commandments” are rewarded in Heaven.  Is there any other conclusion than that schismatics are not?