“...but yet I cannot because not baptised a Catholic receive communion at a Catholic Church alter (sic).”
Sure you can.
Confess, abjure your heretical attachment to Luther, be shriven and then like any other lost sheep (like me), you too can worthily receive Our Lord, Body, Blood, Soul and Divinity at the Holy Altar.
Luther has nothing to do with it. It is all about scripture; ie Acts and Luke.
And what about my Grandmother who was a Catholic?