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However, George Forsyth restored Alvechurch’s two-goal cushion after the break as Kyle Storer’s side ended a run of six league games without a win.
The result means Alvechurch sit fifth in the Southern League Premier Central table, six points behind leaders Real Bedford with a game in hand.
Church broke the deadlock on 12 minutes when Okafor raced clean through on goal and rounded the goalkeeper before finishing into an empty net.
And the striker scored his seventh goal in five games on 19 minutes when he peeled off his marker and fired past Callum Robinson.
But Leiston responded just two minutes later as Sayer found the bottom left corner at the second attempt after driving towards the penalty area.
Church reestablished their two-goal advantage after the break on 62 minutes when Forsyth headed in a corner from the left at the back post from close range.
Alvechurch face a long trip to League One side Plymouth Argyle in the first round of the FA Cup on Saturday, November 7 with kick-off at 3pm at Home Park.
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