Why be Catholic?

Pentecost

All being requires a First Cause.

That Cause, to be the First, must be Being Itself, which must be all-perfect being, because any second god, to differ from the First, would have to have some perfection lacking to the First.

So the true God can be only one.

This one true God took human nature once, and only once, in the divine Person of Our Lord Jesus Christ, who proved his divinity by a quantity and quality of miracles that have accompanied no other man ever, but have accompanied his Church ever since: the Roman Catholic Church.

Membership of that Church is by faith and is open to all men.

If they believe, that is the indispensable start of their eternal salvation.

If they refuse to believe, they are on their way to eternal damnation.

c.f. Mark 16:16